]> The Tcpdump Group git mirrors - tcpdump/blobdiff - print-bootp.c
remove redundant ND_TCHECK, let GET_ routines handle checks
[tcpdump] / print-bootp.c
index 5e7e9a999edb38b67396236c0f7f3b692d24dcbc..1ee979f5d2e02ff05c31d07c5c1a070cf59efeb9 100644 (file)
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- *
- * Format and print bootp packets.
  */
 
-#define NETDISSECT_REWORKED
+/* \summary: BOOTP and IPv4 DHCP printer */
+
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
 
 #include <string.h>
 
-#include "interface.h"
+#include "netdissect.h"
 #include "addrtoname.h"
 #include "extract.h"
-#include "bootp.h"
 
-static const char tstr[] = " [|bootp]";
+
+/*
+ * Bootstrap Protocol (BOOTP).  RFC951 and RFC1048.
+ *
+ * This file specifies the "implementation-independent" BOOTP protocol
+ * information which is common to both client and server.
+ *
+ * Copyright 1988 by Carnegie Mellon.
+ *
+ * Permission to use, copy, modify, and distribute this program for any
+ * purpose and without fee is hereby granted, provided that this copyright
+ * and permission notice appear on all copies and supporting documentation,
+ * the name of Carnegie Mellon not be used in advertising or publicity
+ * pertaining to distribution of the program without specific prior
+ * permission, and notice be given in supporting documentation that copying
+ * and distribution is by permission of Carnegie Mellon and Stanford
+ * University.  Carnegie Mellon makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as is"
+ * without express or implied warranty.
+ */
+
+struct bootp {
+       nd_uint8_t      bp_op;          /* packet opcode type */
+       nd_uint8_t      bp_htype;       /* hardware addr type */
+       nd_uint8_t      bp_hlen;        /* hardware addr length */
+       nd_uint8_t      bp_hops;        /* gateway hops */
+       nd_uint32_t     bp_xid;         /* transaction ID */
+       nd_uint16_t     bp_secs;        /* seconds since boot began */
+       nd_uint16_t     bp_flags;       /* flags - see bootp_flag_values[]
+                                          in print-bootp.c */
+       nd_ipv4         bp_ciaddr;      /* client IP address */
+       nd_ipv4         bp_yiaddr;      /* 'your' IP address */
+       nd_ipv4         bp_siaddr;      /* server IP address */
+       nd_ipv4         bp_giaddr;      /* gateway IP address */
+       nd_byte         bp_chaddr[16];  /* client hardware address */
+       nd_byte         bp_sname[64];   /* server host name */
+       nd_byte         bp_file[128];   /* boot file name */
+       nd_byte         bp_vend[64];    /* vendor-specific area */
+};
+
+#define BOOTPREPLY     2
+#define BOOTPREQUEST   1
+
+/*
+ * Vendor magic cookie (v_magic) for CMU
+ */
+#define VM_CMU         "CMU"
+
+/*
+ * Vendor magic cookie (v_magic) for RFC1048
+ */
+#define VM_RFC1048     { 99, 130, 83, 99 }
+
+/*
+ * RFC1048 tag values used to specify what information is being supplied in
+ * the vendor field of the packet.
+ */
+
+#define TAG_PAD                        ((uint8_t)   0)
+#define TAG_SUBNET_MASK                ((uint8_t)   1)
+#define TAG_TIME_OFFSET                ((uint8_t)   2)
+#define TAG_GATEWAY            ((uint8_t)   3)
+#define TAG_TIME_SERVER                ((uint8_t)   4)
+#define TAG_NAME_SERVER                ((uint8_t)   5)
+#define TAG_DOMAIN_SERVER      ((uint8_t)   6)
+#define TAG_LOG_SERVER         ((uint8_t)   7)
+#define TAG_COOKIE_SERVER      ((uint8_t)   8)
+#define TAG_LPR_SERVER         ((uint8_t)   9)
+#define TAG_IMPRESS_SERVER     ((uint8_t)  10)
+#define TAG_RLP_SERVER         ((uint8_t)  11)
+#define TAG_HOSTNAME           ((uint8_t)  12)
+#define TAG_BOOTSIZE           ((uint8_t)  13)
+#define TAG_END                        ((uint8_t) 255)
+/* RFC1497 tags */
+#define        TAG_DUMPPATH            ((uint8_t)  14)
+#define        TAG_DOMAINNAME          ((uint8_t)  15)
+#define        TAG_SWAP_SERVER         ((uint8_t)  16)
+#define        TAG_ROOTPATH            ((uint8_t)  17)
+#define        TAG_EXTPATH             ((uint8_t)  18)
+/* RFC2132 */
+#define        TAG_IP_FORWARD          ((uint8_t)  19)
+#define        TAG_NL_SRCRT            ((uint8_t)  20)
+#define        TAG_PFILTERS            ((uint8_t)  21)
+#define        TAG_REASS_SIZE          ((uint8_t)  22)
+#define        TAG_DEF_TTL             ((uint8_t)  23)
+#define        TAG_MTU_TIMEOUT         ((uint8_t)  24)
+#define        TAG_MTU_TABLE           ((uint8_t)  25)
+#define        TAG_INT_MTU             ((uint8_t)  26)
+#define        TAG_LOCAL_SUBNETS       ((uint8_t)  27)
+#define        TAG_BROAD_ADDR          ((uint8_t)  28)
+#define        TAG_DO_MASK_DISC        ((uint8_t)  29)
+#define        TAG_SUPPLY_MASK         ((uint8_t)  30)
+#define        TAG_DO_RDISC            ((uint8_t)  31)
+#define        TAG_RTR_SOL_ADDR        ((uint8_t)  32)
+#define        TAG_STATIC_ROUTE        ((uint8_t)  33)
+#define        TAG_USE_TRAILERS        ((uint8_t)  34)
+#define        TAG_ARP_TIMEOUT         ((uint8_t)  35)
+#define        TAG_ETH_ENCAP           ((uint8_t)  36)
+#define        TAG_TCP_TTL             ((uint8_t)  37)
+#define        TAG_TCP_KEEPALIVE       ((uint8_t)  38)
+#define        TAG_KEEPALIVE_GO        ((uint8_t)  39)
+#define        TAG_NIS_DOMAIN          ((uint8_t)  40)
+#define        TAG_NIS_SERVERS         ((uint8_t)  41)
+#define        TAG_NTP_SERVERS         ((uint8_t)  42)
+#define        TAG_VENDOR_OPTS         ((uint8_t)  43)
+#define        TAG_NETBIOS_NS          ((uint8_t)  44)
+#define        TAG_NETBIOS_DDS         ((uint8_t)  45)
+#define        TAG_NETBIOS_NODE        ((uint8_t)  46)
+#define        TAG_NETBIOS_SCOPE       ((uint8_t)  47)
+#define        TAG_XWIN_FS             ((uint8_t)  48)
+#define        TAG_XWIN_DM             ((uint8_t)  49)
+#define        TAG_NIS_P_DOMAIN        ((uint8_t)  64)
+#define        TAG_NIS_P_SERVERS       ((uint8_t)  65)
+#define        TAG_MOBILE_HOME         ((uint8_t)  68)
+#define        TAG_SMPT_SERVER         ((uint8_t)  69)
+#define        TAG_POP3_SERVER         ((uint8_t)  70)
+#define        TAG_NNTP_SERVER         ((uint8_t)  71)
+#define        TAG_WWW_SERVER          ((uint8_t)  72)
+#define        TAG_FINGER_SERVER       ((uint8_t)  73)
+#define        TAG_IRC_SERVER          ((uint8_t)  74)
+#define        TAG_STREETTALK_SRVR     ((uint8_t)  75)
+#define        TAG_STREETTALK_STDA     ((uint8_t)  76)
+/* DHCP options */
+#define        TAG_REQUESTED_IP        ((uint8_t)  50)
+#define        TAG_IP_LEASE            ((uint8_t)  51)
+#define        TAG_OPT_OVERLOAD        ((uint8_t)  52)
+#define        TAG_TFTP_SERVER         ((uint8_t)  66)
+#define        TAG_BOOTFILENAME        ((uint8_t)  67)
+#define        TAG_DHCP_MESSAGE        ((uint8_t)  53)
+#define        TAG_SERVER_ID           ((uint8_t)  54)
+#define        TAG_PARM_REQUEST        ((uint8_t)  55)
+#define        TAG_MESSAGE             ((uint8_t)  56)
+#define        TAG_MAX_MSG_SIZE        ((uint8_t)  57)
+#define        TAG_RENEWAL_TIME        ((uint8_t)  58)
+#define        TAG_REBIND_TIME         ((uint8_t)  59)
+#define        TAG_VENDOR_CLASS        ((uint8_t)  60)
+#define        TAG_CLIENT_ID           ((uint8_t)  61)
+/* RFC 2241 */
+#define        TAG_NDS_SERVERS         ((uint8_t)  85)
+#define        TAG_NDS_TREE_NAME       ((uint8_t)  86)
+#define        TAG_NDS_CONTEXT         ((uint8_t)  87)
+/* RFC 2242 */
+#define        TAG_NDS_IPDOMAIN        ((uint8_t)  62)
+#define        TAG_NDS_IPINFO          ((uint8_t)  63)
+/* RFC 2485 */
+#define        TAG_OPEN_GROUP_UAP      ((uint8_t)  98)
+/* RFC 2563 */
+#define        TAG_DISABLE_AUTOCONF    ((uint8_t) 116)
+/* RFC 2610 */
+#define        TAG_SLP_DA              ((uint8_t)  78)
+#define        TAG_SLP_SCOPE           ((uint8_t)  79)
+/* RFC 2937 */
+#define        TAG_NS_SEARCH           ((uint8_t) 117)
+/* RFC 3004 - The User Class Option for DHCP */
+#define        TAG_USER_CLASS          ((uint8_t)  77)
+/* RFC 3011 */
+#define        TAG_IP4_SUBNET_SELECT   ((uint8_t) 118)
+/* RFC 3442 */
+#define TAG_CLASSLESS_STATIC_RT        ((uint8_t) 121)
+#define TAG_CLASSLESS_STA_RT_MS        ((uint8_t) 249)
+/* RFC 5859 - TFTP Server Address Option for DHCPv4 */
+#define        TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150)
+/* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */
+#define        TAG_SLP_NAMING_AUTH     ((uint8_t)  80)
+#define        TAG_CLIENT_FQDN         ((uint8_t)  81)
+#define        TAG_AGENT_CIRCUIT       ((uint8_t)  82)
+#define        TAG_AGENT_REMOTE        ((uint8_t)  83)
+#define        TAG_TZ_STRING           ((uint8_t)  88)
+#define        TAG_FQDN_OPTION         ((uint8_t)  89)
+#define        TAG_AUTH                ((uint8_t)  90)
+#define        TAG_VINES_SERVERS       ((uint8_t)  91)
+#define        TAG_SERVER_RANK         ((uint8_t)  92)
+#define        TAG_CLIENT_ARCH         ((uint8_t)  93)
+#define        TAG_CLIENT_NDI          ((uint8_t)  94)
+#define        TAG_CLIENT_GUID         ((uint8_t)  97)
+#define        TAG_LDAP_URL            ((uint8_t)  95)
+/* RFC 4833, TZ codes */
+#define        TAG_TZ_PCODE            ((uint8_t) 100)
+#define        TAG_TZ_TCODE            ((uint8_t) 101)
+#define        TAG_NETINFO_PARENT      ((uint8_t) 112)
+#define        TAG_NETINFO_PARENT_TAG  ((uint8_t) 113)
+#define        TAG_URL                 ((uint8_t) 114)
+#define TAG_MUDURL              ((uint8_t) 161)
+
+/* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
+#define DHCPDISCOVER   1
+#define DHCPOFFER      2
+#define DHCPREQUEST    3
+#define DHCPDECLINE    4
+#define DHCPACK                5
+#define DHCPNAK                6
+#define DHCPRELEASE    7
+#define DHCPINFORM     8
+
+/*
+ * "vendor" data permitted for CMU bootp clients.
+ */
+
+struct cmu_vend {
+       nd_byte         v_magic[4];     /* magic number */
+       nd_uint32_t     v_flags;        /* flags/opcodes, etc. */
+       nd_ipv4         v_smask;        /* Subnet mask */
+       nd_ipv4         v_dgate;        /* Default gateway */
+       nd_ipv4         v_dns1, v_dns2; /* Domain name servers */
+       nd_ipv4         v_ins1, v_ins2; /* IEN-116 name servers */
+       nd_ipv4         v_ts1, v_ts2;   /* Time servers */
+       nd_byte         v_unused[24];   /* currently unused */
+};
+
+
+/* v_flags values */
+#define VF_SMASK       1       /* Subnet mask field contains valid data */
+
+/* RFC 4702 DHCP Client FQDN Option */
+
+#define CLIENT_FQDN_FLAGS_S    0x01
+#define CLIENT_FQDN_FLAGS_O    0x02
+#define CLIENT_FQDN_FLAGS_E    0x04
+#define CLIENT_FQDN_FLAGS_N    0x08
+/* end of original bootp.h */
 
 static void rfc1048_print(netdissect_options *, const u_char *);
 static void cmu_print(netdissect_options *, const u_char *);
 static char *client_fqdn_flags(u_int flags);
 
 static const struct tok bootp_flag_values[] = {
-    { 0x8000,                   "Broadcast" },
-    { 0, NULL}
+       { 0x8000,       "Broadcast" },
+       { 0, NULL}
 };
 
 static const struct tok bootp_op_values[] = {
-    { BOOTPREQUEST,             "Request" },
-    { BOOTPREPLY,               "Reply" },
-    { 0, NULL}
+       { BOOTPREQUEST, "Request" },
+       { BOOTPREPLY,   "Reply" },
+       { 0, NULL}
 };
 
 /*
@@ -57,117 +274,114 @@ static const struct tok bootp_op_values[] = {
  */
 void
 bootp_print(netdissect_options *ndo,
-            register const u_char *cp, u_int length)
+           const u_char *cp, u_int length)
 {
-       register const struct bootp *bp;
+       const struct bootp *bp;
        static const u_char vm_cmu[4] = VM_CMU;
        static const u_char vm_rfc1048[4] = VM_RFC1048;
+       uint8_t bp_op, bp_htype, bp_hlen;
 
+       ndo->ndo_protocol = "bootp";
        bp = (const struct bootp *)cp;
-       ND_TCHECK(bp->bp_op);
-
-       ND_PRINT((ndo, "BOOTP/DHCP, %s",
-                 tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)));
-
-       if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
-               ND_TCHECK2(bp->bp_chaddr[0], 6);
-               ND_PRINT((ndo, " from %s", etheraddr_string(ndo, bp->bp_chaddr)));
+       bp_op = GET_U_1(bp->bp_op);
+       ND_PRINT("BOOTP/DHCP, %s",
+                 tok2str(bootp_op_values, "unknown (0x%02x)", bp_op));
+
+       bp_htype = GET_U_1(bp->bp_htype);
+       bp_hlen = GET_U_1(bp->bp_hlen);
+       if (bp_htype == 1 && bp_hlen == 6 && bp_op == BOOTPREQUEST) {
+               ND_PRINT(" from %s", GET_ETHERADDR_STRING(bp->bp_chaddr));
        }
 
-       ND_PRINT((ndo, ", length %u", length));
+       ND_PRINT(", length %u", length);
 
        if (!ndo->ndo_vflag)
                return;
 
-       ND_TCHECK(bp->bp_secs);
+       ND_TCHECK_2(bp->bp_secs);
 
        /* The usual hardware address type is 1 (10Mb Ethernet) */
-       if (bp->bp_htype != 1)
-               ND_PRINT((ndo, ", htype %d", bp->bp_htype));
+       if (bp_htype != 1)
+               ND_PRINT(", htype %u", bp_htype);
 
        /* The usual length for 10Mb Ethernet address is 6 bytes */
-       if (bp->bp_htype != 1 || bp->bp_hlen != 6)
-               ND_PRINT((ndo, ", hlen %d", bp->bp_hlen));
+       if (bp_htype != 1 || bp_hlen != 6)
+               ND_PRINT(", hlen %u", bp_hlen);
 
        /* Only print interesting fields */
-       if (bp->bp_hops)
-               ND_PRINT((ndo, ", hops %d", bp->bp_hops));
-       if (EXTRACT_32BITS(&bp->bp_xid))
-               ND_PRINT((ndo, ", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid)));
-       if (EXTRACT_16BITS(&bp->bp_secs))
-               ND_PRINT((ndo, ", secs %d", EXTRACT_16BITS(&bp->bp_secs)));
-
-       ND_PRINT((ndo, ", Flags [%s]",
-               bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))));
+       if (GET_U_1(bp->bp_hops))
+               ND_PRINT(", hops %u", GET_U_1(bp->bp_hops));
+       if (GET_BE_U_4(bp->bp_xid))
+               ND_PRINT(", xid 0x%x", GET_BE_U_4(bp->bp_xid));
+       if (GET_BE_U_2(bp->bp_secs))
+               ND_PRINT(", secs %u", GET_BE_U_2(bp->bp_secs));
+
+       ND_PRINT(", Flags [%s]",
+                 bittok2str(bootp_flag_values, "none", GET_BE_U_2(bp->bp_flags)));
        if (ndo->ndo_vflag > 1)
-               ND_PRINT((ndo, " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags)));
+               ND_PRINT(" (0x%04x)", GET_BE_U_2(bp->bp_flags));
 
        /* Client's ip address */
-       ND_TCHECK(bp->bp_ciaddr);
-       if (EXTRACT_32BITS(&bp->bp_ciaddr.s_addr))
-               ND_PRINT((ndo, "\n\t  Client-IP %s", ipaddr_string(ndo, &bp->bp_ciaddr)));
+       if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_ciaddr))
+               ND_PRINT("\n\t  Client-IP %s", GET_IPADDR_STRING(bp->bp_ciaddr));
 
        /* 'your' ip address (bootp client) */
-       ND_TCHECK(bp->bp_yiaddr);
-       if (EXTRACT_32BITS(&bp->bp_yiaddr.s_addr))
-               ND_PRINT((ndo, "\n\t  Your-IP %s", ipaddr_string(ndo, &bp->bp_yiaddr)));
+       if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_yiaddr))
+               ND_PRINT("\n\t  Your-IP %s", GET_IPADDR_STRING(bp->bp_yiaddr));
 
        /* Server's ip address */
-       ND_TCHECK(bp->bp_siaddr);
-       if (EXTRACT_32BITS(&bp->bp_siaddr.s_addr))
-               ND_PRINT((ndo, "\n\t  Server-IP %s", ipaddr_string(ndo, &bp->bp_siaddr)));
+       if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_siaddr))
+               ND_PRINT("\n\t  Server-IP %s", GET_IPADDR_STRING(bp->bp_siaddr));
 
        /* Gateway's ip address */
-       ND_TCHECK(bp->bp_giaddr);
-       if (EXTRACT_32BITS(&bp->bp_giaddr.s_addr))
-               ND_PRINT((ndo, "\n\t  Gateway-IP %s", ipaddr_string(ndo, &bp->bp_giaddr)));
+       if (GET_IPV4_TO_NETWORK_ORDER(bp->bp_giaddr))
+               ND_PRINT("\n\t  Gateway-IP %s", GET_IPADDR_STRING(bp->bp_giaddr));
 
        /* Client's Ethernet address */
-       if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
-               ND_TCHECK2(bp->bp_chaddr[0], 6);
-               ND_PRINT((ndo, "\n\t  Client-Ethernet-Address %s", etheraddr_string(ndo, bp->bp_chaddr)));
+       if (bp_htype == 1 && bp_hlen == 6) {
+               ND_PRINT("\n\t  Client-Ethernet-Address %s", GET_ETHERADDR_STRING(bp->bp_chaddr));
        }
 
-       ND_TCHECK2(bp->bp_sname[0], 1);         /* check first char only */
-       if (*bp->bp_sname) {
-               ND_PRINT((ndo, "\n\t  sname \""));
-               if (fn_print(ndo, bp->bp_sname, ndo->ndo_snapend)) {
-                       ND_PRINT((ndo, "\""));
-                       ND_PRINT((ndo, "%s", tstr + 1));
+       if (GET_U_1(bp->bp_sname)) {    /* get first char only */
+               ND_PRINT("\n\t  sname \"");
+               if (nd_printztn(ndo, bp->bp_sname, (u_int)sizeof(bp->bp_sname),
+                               ndo->ndo_snapend) == 0) {
+                       ND_PRINT("\"");
+                       nd_print_trunc(ndo);
                        return;
                }
-               ND_PRINT((ndo, "\""));
+               ND_PRINT("\"");
        }
-       ND_TCHECK2(bp->bp_file[0], 1);          /* check first char only */
-       if (*bp->bp_file) {
-               ND_PRINT((ndo, "\n\t  file \""));
-               if (fn_print(ndo, bp->bp_file, ndo->ndo_snapend)) {
-                       ND_PRINT((ndo, "\""));
-                       ND_PRINT((ndo, "%s", tstr + 1));
+       if (GET_U_1(bp->bp_file)) {     /* get first char only */
+               ND_PRINT("\n\t  file \"");
+               if (nd_printztn(ndo, bp->bp_file, (u_int)sizeof(bp->bp_file),
+                               ndo->ndo_snapend) == 0) {
+                       ND_PRINT("\"");
+                       nd_print_trunc(ndo);
                        return;
                }
-               ND_PRINT((ndo, "\""));
+               ND_PRINT("\"");
        }
 
        /* Decode the vendor buffer */
-       ND_TCHECK(bp->bp_vend[0]);
+       ND_TCHECK_4(bp->bp_vend);
        if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
-                sizeof(u_int32_t)) == 0)
+                   sizeof(uint32_t)) == 0)
                rfc1048_print(ndo, bp->bp_vend);
        else if (memcmp((const char *)bp->bp_vend, vm_cmu,
-                     sizeof(u_int32_t)) == 0)
+                       sizeof(uint32_t)) == 0)
                cmu_print(ndo, bp->bp_vend);
        else {
-               u_int32_t ul;
+               uint32_t ul;
 
-               ul = EXTRACT_32BITS(&bp->bp_vend);
+               ul = GET_BE_U_4(bp->bp_vend);
                if (ul != 0)
-                       ND_PRINT((ndo, "\n\t  Vendor-#0x%x", ul));
+                       ND_PRINT("\n\t  Vendor-#0x%x", ul);
        }
 
        return;
 trunc:
-       ND_PRINT((ndo, "%s", tstr));
+       nd_print_trunc(ndo);
 }
 
 /*
@@ -177,9 +391,9 @@ trunc:
  *     l - long (32 bits)
  *     L - unsigned long (32 bits)
  *     s - short (16 bits)
- *     b - period-seperated decimal bytes (variable length)
- *     x - colon-seperated hex bytes (variable length)
- *     a - ascii string (variable length)
+ *     b - period-separated decimal bytes (variable length)
+ *     x - colon-separated hex bytes (variable length)
+ *     a - ASCII string (variable length)
  *     B - on/off (8 bits)
  *     $ - special (explicit code to handle)
  */
@@ -197,7 +411,7 @@ static const struct tok tag2str[] = {
        { TAG_LPR_SERVER,       "iLPR-Server" },        /* lpr server (RFC1179) */
        { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
        { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
-       { TAG_HOSTNAME,         "aHostname" },  /* ascii hostname */
+       { TAG_HOSTNAME,         "aHostname" },  /* ASCII hostname */
        { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
        { TAG_END,              " END" },
 /* RFC1497 tags */
@@ -272,18 +486,20 @@ static const struct tok tag2str[] = {
        { TAG_SLP_SCOPE,        "bSLP-SCOPE" }, /*"b" is a little wrong */
 /* RFC 2937 */
        { TAG_NS_SEARCH,        "sNSSEARCH" },  /* XXX 's' */
+/* RFC 3004 - The User Class Option for DHCP */
+       { TAG_USER_CLASS,       "$User-Class" },
 /* RFC 3011 */
        { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
 /* RFC 3442 */
        { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
        { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
-/* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
-       { TAG_USER_CLASS,       "aCLASS" },
+/* RFC 5859 - TFTP Server Address Option for DHCPv4 */
+       { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
+/* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options */
        { TAG_SLP_NAMING_AUTH,  "aSLP-NA" },
        { TAG_CLIENT_FQDN,      "$FQDN" },
        { TAG_AGENT_CIRCUIT,    "$Agent-Information" },
        { TAG_AGENT_REMOTE,     "bARMT" },
-       { TAG_AGENT_MASK,       "bAMSK" },
        { TAG_TZ_STRING,        "aTZSTR" },
        { TAG_FQDN_OPTION,      "bFQDNS" },     /* XXX 'b' */
        { TAG_AUTH,             "bAUTH" },      /* XXX 'b' */
@@ -293,172 +509,142 @@ static const struct tok tag2str[] = {
        { TAG_CLIENT_NDI,       "bNDI" },       /* XXX 'b' */
        { TAG_CLIENT_GUID,      "bGUID" },      /* XXX 'b' */
        { TAG_LDAP_URL,         "aLDAP" },
-       { TAG_6OVER4,           "i6o4" },
-       { TAG_PRINTER_NAME,     "aPRTR" },
-       { TAG_MDHCP_SERVER,     "bMDHCP" },     /* XXX 'b' */
-       { TAG_IPX_COMPAT,       "bIPX" },       /* XXX 'b' */
+       { TAG_TZ_PCODE,         "aPOSIX-TZ" },
+       { TAG_TZ_TCODE,         "aTZ-Name" },
        { TAG_NETINFO_PARENT,   "iNI" },
        { TAG_NETINFO_PARENT_TAG, "aNITAG" },
        { TAG_URL,              "aURL" },
-       { TAG_FAILOVER,         "bFAIL" },      /* XXX 'b' */
-       { 0,                    NULL }
-};
-/* 2-byte extended tags */
-static const struct tok xtag2str[] = {
-       { 0,                    NULL }
+       { TAG_MUDURL,           "aMUD-URL" },
+       { 0, NULL }
 };
 
 /* DHCP "options overload" types */
 static const struct tok oo2str[] = {
-       { 1,                    "file" },
-       { 2,                    "sname" },
-       { 3,                    "file+sname" },
-       { 0,                    NULL }
+       { 1,    "file" },
+       { 2,    "sname" },
+       { 3,    "file+sname" },
+       { 0, NULL }
 };
 
 /* NETBIOS over TCP/IP node type options */
 static const struct tok nbo2str[] = {
-       { 0x1,                  "b-node" },
-       { 0x2,                  "p-node" },
-       { 0x4,                  "m-node" },
-       { 0x8,                  "h-node" },
-       { 0,                    NULL }
+       { 0x1,  "b-node" },
+       { 0x2,  "p-node" },
+       { 0x4,  "m-node" },
+       { 0x8,  "h-node" },
+       { 0, NULL }
 };
 
 /* ARP Hardware types, for Client-ID option */
 static const struct tok arp2str[] = {
-       { 0x1,                  "ether" },
-       { 0x6,                  "ieee802" },
-       { 0x7,                  "arcnet" },
-       { 0xf,                  "frelay" },
-       { 0x17,                 "strip" },
-       { 0x18,                 "ieee1394" },
-       { 0,                    NULL }
+       { 0x1,  "ether" },
+       { 0x6,  "ieee802" },
+       { 0x7,  "arcnet" },
+       { 0xf,  "frelay" },
+       { 0x17, "strip" },
+       { 0x18, "ieee1394" },
+       { 0, NULL }
 };
 
 static const struct tok dhcp_msg_values[] = {
-        { DHCPDISCOVER, "Discover" },
-        { DHCPOFFER, "Offer" },
-        { DHCPREQUEST, "Request" },
-        { DHCPDECLINE, "Decline" },
-        { DHCPACK, "ACK" },
-        { DHCPNAK, "NACK" },
-        { DHCPRELEASE, "Release" },
-        { DHCPINFORM, "Inform" },
-        { 0,                   NULL }
+       { DHCPDISCOVER, "Discover" },
+       { DHCPOFFER,    "Offer" },
+       { DHCPREQUEST,  "Request" },
+       { DHCPDECLINE,  "Decline" },
+       { DHCPACK,      "ACK" },
+       { DHCPNAK,      "NACK" },
+       { DHCPRELEASE,  "Release" },
+       { DHCPINFORM,   "Inform" },
+       { 0, NULL }
 };
 
-#define AGENT_SUBOPTION_CIRCUIT_ID     1       /* RFC 3046 */
-#define AGENT_SUBOPTION_REMOTE_ID      2       /* RFC 3046 */
-#define AGENT_SUBOPTION_SUBSCRIBER_ID  6       /* RFC 3993 */
+#define AGENT_SUBOPTION_CIRCUIT_ID     1       /* RFC 3046 */
+#define AGENT_SUBOPTION_REMOTE_ID      2       /* RFC 3046 */
+#define AGENT_SUBOPTION_SUBSCRIBER_ID  6       /* RFC 3993 */
 static const struct tok agent_suboption_values[] = {
-        { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
-        { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
-        { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
-        { 0,                   NULL }
+       { AGENT_SUBOPTION_CIRCUIT_ID,    "Circuit-ID" },
+       { AGENT_SUBOPTION_REMOTE_ID,     "Remote-ID" },
+       { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
+       { 0, NULL }
 };
 
 
 static void
 rfc1048_print(netdissect_options *ndo,
-              register const u_char *bp)
+             const u_char *bp)
 {
-       register u_int16_t tag;
-       register u_int len;
-       register const char *cp;
-       register char c;
+       uint16_t tag;
+       u_int len;
+       const char *cp;
+       char c;
        int first, idx;
-       u_int32_t ul;
-       u_int16_t us;
-       u_int8_t uc, subopt, suboptlen;
+       uint8_t subopt, suboptlen;
 
-       ND_PRINT((ndo, "\n\t  Vendor-rfc1048 Extensions"));
+       ND_PRINT("\n\t  Vendor-rfc1048 Extensions");
 
        /* Step over magic cookie */
-       ND_PRINT((ndo, "\n\t    Magic Cookie 0x%08x", EXTRACT_32BITS(bp)));
+       ND_PRINT("\n\t    Magic Cookie 0x%08x", GET_BE_U_4(bp));
        bp += sizeof(int32_t);
 
        /* Loop while we there is a tag left in the buffer */
-       while (ND_TTEST2(*bp, 1)) {
-               tag = *bp++;
+       while (ND_TTEST_1(bp)) {
+               tag = GET_U_1(bp);
+               bp++;
                if (tag == TAG_PAD && ndo->ndo_vflag < 3)
                        continue;
                if (tag == TAG_END && ndo->ndo_vflag < 3)
                        return;
-               if (tag == TAG_EXTENDED_OPTION) {
-                       ND_TCHECK2(*(bp + 1), 2);
-                       tag = EXTRACT_16BITS(bp + 1);
-                       /* XXX we don't know yet if the IANA will
-                        * preclude overlap of 1-byte and 2-byte spaces.
-                        * If not, we need to offset tag after this step.
-                        */
-                       cp = tok2str(xtag2str, "?xT%u", tag);
-               } else
-                       cp = tok2str(tag2str, "?T%u", tag);
+               cp = tok2str(tag2str, "?Unknown", tag);
                c = *cp++;
 
                if (tag == TAG_PAD || tag == TAG_END)
                        len = 0;
                else {
                        /* Get the length; check for truncation */
-                       ND_TCHECK2(*bp, 1);
-                       len = *bp++;
+                       len = GET_U_1(bp);
+                       bp++;
                }
 
-               ND_PRINT((ndo, "\n\t    %s Option %u, length %u%s", cp, tag, len,
-                   len > 0 ? ": " : ""));
+               ND_PRINT("\n\t    %s (%u), length %u%s", cp, tag, len,
+                         len > 0 ? ": " : "");
 
                if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
                        u_int ntag = 1;
-                       while (ND_TTEST2(*bp, 1) && *bp == TAG_PAD) {
+                       while (ND_TTEST_1(bp) &&
+                              GET_U_1(bp) == TAG_PAD) {
                                bp++;
                                ntag++;
                        }
                        if (ntag > 1)
-                               ND_PRINT((ndo, ", occurs %u", ntag));
+                               ND_PRINT(", occurs %u", ntag);
                }
 
-               if (!ND_TTEST2(*bp, len)) {
-                       ND_PRINT((ndo, "[|rfc1048 %u]", len));
-                       return;
-               }
+               ND_TCHECK_LEN(bp, len);
 
                if (tag == TAG_DHCP_MESSAGE && len == 1) {
-                       uc = *bp++;
-                       ND_PRINT((ndo, "%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc)));
+                       ND_PRINT("%s",
+                                tok2str(dhcp_msg_values, "Unknown (%u)", GET_U_1(bp)));
+                       bp++;
                        continue;
                }
 
                if (tag == TAG_PARM_REQUEST) {
                        idx = 0;
-                       while (len-- > 0) {
-                               uc = *bp++;
-                               cp = tok2str(tag2str, "?Option %u", uc);
+                       while (len > 0) {
+                               uint8_t innertag = GET_U_1(bp);
+                               bp++;
+                               len--;
+                               cp = tok2str(tag2str, "?Unknown", innertag);
                                if (idx % 4 == 0)
-                                       ND_PRINT((ndo, "\n\t      "));
+                                       ND_PRINT("\n\t      ");
                                else
-                                       ND_PRINT((ndo, ", "));
-                               ND_PRINT((ndo, "%s", cp + 1));
+                                       ND_PRINT(", ");
+                               ND_PRINT("%s (%u)", cp + 1, innertag);
                                idx++;
                        }
                        continue;
                }
 
-               if (tag == TAG_EXTENDED_REQUEST) {
-                       first = 1;
-                       while (len > 1) {
-                               len -= 2;
-                               us = EXTRACT_16BITS(bp);
-                               bp += 2;
-                               cp = tok2str(xtag2str, "?xT%u", us);
-                               if (!first)
-                                       ND_PRINT((ndo, "+"));
-                               ND_PRINT((ndo, "%s", cp + 1));
-                               first = 0;
-                       }
-                       continue;
-               }
-
                /* Print data */
                if (c == '?') {
                        /* Base default formats for unknown tags on data size */
@@ -473,13 +659,13 @@ rfc1048_print(netdissect_options *ndo,
                switch (c) {
 
                case 'a':
-                       /* ascii strings */
-                       ND_PRINT((ndo, "\""));
-                       if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
-                               ND_PRINT((ndo, "\""));
+                       /* ASCII strings */
+                       ND_PRINT("\"");
+                       if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) {
+                               ND_PRINT("\"");
                                goto trunc;
                        }
-                       ND_PRINT((ndo, "\""));
+                       ND_PRINT("\"");
                        bp += len;
                        len = 0;
                        break;
@@ -488,48 +674,44 @@ rfc1048_print(netdissect_options *ndo,
                case 'l':
                case 'L':
                        /* ip addresses/32-bit words */
-                       while (len >= sizeof(ul)) {
+                       while (len >= 4) {
                                if (!first)
-                                       ND_PRINT((ndo, ","));
-                               ul = EXTRACT_32BITS(bp);
-                               if (c == 'i') {
-                                       ul = htonl(ul);
-                                       ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ul)));
-                               } else if (c == 'L')
-                                       ND_PRINT((ndo, "%d", ul));
+                                       ND_PRINT(",");
+                               if (c == 'i')
+                                       ND_PRINT("%s", GET_IPADDR_STRING(bp));
+                               else if (c == 'L')
+                                       ND_PRINT("%d", GET_BE_S_4(bp));
                                else
-                                       ND_PRINT((ndo, "%u", ul));
-                               bp += sizeof(ul);
-                               len -= sizeof(ul);
+                                       ND_PRINT("%u", GET_BE_U_4(bp));
+                               bp += 4;
+                               len -= 4;
                                first = 0;
                        }
                        break;
 
                case 'p':
                        /* IP address pairs */
-                       while (len >= 2*sizeof(ul)) {
+                       while (len >= 2*4) {
                                if (!first)
-                                       ND_PRINT((ndo, ","));
-                               memcpy((char *)&ul, (const char *)bp, sizeof(ul));
-                               ND_PRINT((ndo, "(%s:", ipaddr_string(ndo, &ul)));
-                               bp += sizeof(ul);
-                               memcpy((char *)&ul, (const char *)bp, sizeof(ul));
-                               ND_PRINT((ndo, "%s)", ipaddr_string(ndo, &ul)));
-                               bp += sizeof(ul);
-                               len -= 2*sizeof(ul);
+                                       ND_PRINT(",");
+                               ND_PRINT("(%s:", GET_IPADDR_STRING(bp));
+                               bp += 4;
+                               len -= 4;
+                               ND_PRINT("%s)", GET_IPADDR_STRING(bp));
+                               bp += 4;
+                               len -= 4;
                                first = 0;
                        }
                        break;
 
                case 's':
                        /* shorts */
-                       while (len >= sizeof(us)) {
+                       while (len >= 2) {
                                if (!first)
-                                       ND_PRINT((ndo, ","));
-                               us = EXTRACT_16BITS(bp);
-                               ND_PRINT((ndo, "%u", us));
-                               bp += sizeof(us);
-                               len -= sizeof(us);
+                                       ND_PRINT(",");
+                               ND_PRINT("%u", GET_BE_U_2(bp));
+                               bp += 2;
+                               len -= 2;
                                first = 0;
                        }
                        break;
@@ -537,17 +719,19 @@ rfc1048_print(netdissect_options *ndo,
                case 'B':
                        /* boolean */
                        while (len > 0) {
+                               uint8_t bool_value;
                                if (!first)
-                                       ND_PRINT((ndo, ","));
-                               switch (*bp) {
+                                       ND_PRINT(",");
+                               bool_value = GET_U_1(bp);
+                               switch (bool_value) {
                                case 0:
-                                       ND_PRINT((ndo, "N"));
+                                       ND_PRINT("N");
                                        break;
                                case 1:
-                                       ND_PRINT((ndo, "Y"));
+                                       ND_PRINT("Y");
                                        break;
                                default:
-                                       ND_PRINT((ndo, "%u?", *bp));
+                                       ND_PRINT("%u?", bool_value);
                                        break;
                                }
                                ++bp;
@@ -561,12 +745,14 @@ rfc1048_print(netdissect_options *ndo,
                default:
                        /* Bytes */
                        while (len > 0) {
+                               uint8_t byte_value;
                                if (!first)
-                                       ND_PRINT((ndo, c == 'x' ? ":" : "."));
+                                       ND_PRINT(c == 'x' ? ":" : ".");
+                               byte_value = GET_U_1(bp);
                                if (c == 'x')
-                                       ND_PRINT((ndo, "%02x", *bp));
+                                       ND_PRINT("%02x", byte_value);
                                else
-                                       ND_PRINT((ndo, "%u", *bp));
+                                       ND_PRINT("%u", byte_value);
                                ++bp;
                                --len;
                                first = 0;
@@ -579,80 +765,86 @@ rfc1048_print(netdissect_options *ndo,
 
                        case TAG_NETBIOS_NODE:
                                /* this option should be at least 1 byte long */
-                               if (len < 1)  {
-                                       ND_PRINT((ndo, "ERROR: option %u len %u < 1 bytes",
-                                           TAG_NETBIOS_NODE, len));
+                               if (len < 1) {
+                                       ND_PRINT("[ERROR: length < 1 bytes]");
                                        break;
                                }
-                               tag = *bp++;
+                               tag = GET_U_1(bp);
+                               ++bp;
                                --len;
-                               ND_PRINT((ndo, "%s", tok2str(nbo2str, NULL, tag)));
+                               ND_PRINT("%s", tok2str(nbo2str, NULL, tag));
                                break;
 
                        case TAG_OPT_OVERLOAD:
                                /* this option should be at least 1 byte long */
-                               if (len < 1)  {
-                                       ND_PRINT((ndo, "ERROR: option %u len %u < 1 bytes",
-                                           TAG_OPT_OVERLOAD, len));
+                               if (len < 1) {
+                                       ND_PRINT("[ERROR: length < 1 bytes]");
                                        break;
                                }
-                               tag = *bp++;
+                               tag = GET_U_1(bp);
+                               ++bp;
                                --len;
-                               ND_PRINT((ndo, "%s", tok2str(oo2str, NULL, tag)));
+                               ND_PRINT("%s", tok2str(oo2str, NULL, tag));
                                break;
 
                        case TAG_CLIENT_FQDN:
                                /* this option should be at least 3 bytes long */
-                               if (len < 3)  {
-                                       ND_PRINT((ndo, "ERROR: option %u len %u < 3 bytes",
-                                           TAG_CLIENT_FQDN, len));
+                               if (len < 3) {
+                                       ND_PRINT("[ERROR: length < 3 bytes]");
                                        bp += len;
                                        len = 0;
                                        break;
                                }
-                               if (*bp)
-                                       ND_PRINT((ndo, "[%s] ", client_fqdn_flags(*bp)));
+                               if (GET_U_1(bp) & 0xf0) {
+                                       ND_PRINT("[ERROR: MBZ nibble 0x%x != 0] ",
+                                                (GET_U_1(bp) & 0xf0) >> 4);
+                               }
+                               if (GET_U_1(bp) & 0x0f)
+                                       ND_PRINT("[%s] ",
+                                                client_fqdn_flags(GET_U_1(bp)));
                                bp++;
-                               if (*bp || *(bp+1))
-                                       ND_PRINT((ndo, "%u/%u ", *bp, *(bp+1)));
+                               if (GET_U_1(bp) || GET_U_1(bp + 1))
+                                       ND_PRINT("%u/%u ", GET_U_1(bp),
+                                                GET_U_1(bp + 1));
                                bp += 2;
-                               ND_PRINT((ndo, "\""));
-                               if (fn_printn(ndo, bp, len - 3, ndo->ndo_snapend)) {
-                                       ND_PRINT((ndo, "\""));
+                               ND_PRINT("\"");
+                               if (nd_printn(ndo, bp, len - 3, ndo->ndo_snapend)) {
+                                       ND_PRINT("\"");
                                        goto trunc;
                                }
-                               ND_PRINT((ndo, "\""));
+                               ND_PRINT("\"");
                                bp += len - 3;
                                len = 0;
                                break;
 
                        case TAG_CLIENT_ID:
-                           {   int type;
+                           {
+                               int type;
 
                                /* this option should be at least 1 byte long */
-                               if (len < 1)  {
-                                       ND_PRINT((ndo, "ERROR: option %u len %u < 1 bytes",
-                                           TAG_CLIENT_ID, len));
+                               if (len < 1) {
+                                       ND_PRINT("[ERROR: length < 1 bytes]");
                                        break;
                                }
-                               type = *bp++;
+                               type = GET_U_1(bp);
+                               bp++;
                                len--;
                                if (type == 0) {
-                                       ND_PRINT((ndo, "\""));
-                                       if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
-                                               ND_PRINT((ndo, "\""));
+                                       ND_PRINT("\"");
+                                       if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) {
+                                               ND_PRINT("\"");
                                                goto trunc;
                                        }
-                                       ND_PRINT((ndo, "\""));
+                                       ND_PRINT("\"");
                                        bp += len;
                                        len = 0;
                                        break;
                                } else {
-                                       ND_PRINT((ndo, "%s ", tok2str(arp2str, "hardware-type %u,", type)));
+                                       ND_PRINT("%s ", tok2str(arp2str, "hardware-type %u,", type));
                                        while (len > 0) {
                                                if (!first)
-                                                       ND_PRINT((ndo, ":"));
-                                               ND_PRINT((ndo, "%02x", *bp));
+                                                       ND_PRINT(":");
+                                               ND_PRINT("%02x", GET_U_1(bp));
                                                ++bp;
                                                --len;
                                                first = 0;
@@ -663,28 +855,30 @@ rfc1048_print(netdissect_options *ndo,
 
                        case TAG_AGENT_CIRCUIT:
                                while (len >= 2) {
-                                       subopt = *bp++;
-                                       suboptlen = *bp++;
+                                       subopt = GET_U_1(bp);
+                                       suboptlen = GET_U_1(bp + 1);
+                                       bp += 2;
                                        len -= 2;
                                        if (suboptlen > len) {
-                                               ND_PRINT((ndo, "\n\t      %s SubOption %u, length %u: length goes past end of option",
-                                                  tok2str(agent_suboption_values, "Unknown", subopt),
-                                                  subopt,
-                                                  suboptlen));
+                                               ND_PRINT("\n\t      %s SubOption %u, length %u: length goes past end of option",
+                                                         tok2str(agent_suboption_values, "Unknown", subopt),
+                                                         subopt,
+                                                         suboptlen);
                                                bp += len;
                                                len = 0;
                                                break;
                                        }
-                                       ND_PRINT((ndo, "\n\t      %s SubOption %u, length %u: ",
-                                          tok2str(agent_suboption_values, "Unknown", subopt),
-                                          subopt,
-                                          suboptlen));
+                                       ND_PRINT("\n\t      %s SubOption %u, length %u: ",
+                                                 tok2str(agent_suboption_values, "Unknown", subopt),
+                                                 subopt,
+                                                 suboptlen);
                                        switch (subopt) {
 
                                        case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
                                        case AGENT_SUBOPTION_REMOTE_ID:
                                        case AGENT_SUBOPTION_SUBSCRIBER_ID:
-                                               fn_printn(ndo, bp, suboptlen, NULL);
+                                               if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend))
+                                                       goto trunc;
                                                break;
 
                                        default:
@@ -693,30 +887,30 @@ rfc1048_print(netdissect_options *ndo,
 
                                        len -= suboptlen;
                                        bp += suboptlen;
-                           }
-                           break;
+                               }
+                               break;
 
                        case TAG_CLASSLESS_STATIC_RT:
                        case TAG_CLASSLESS_STA_RT_MS:
-                       {
+                           {
                                u_int mask_width, significant_octets, i;
 
                                /* this option should be at least 5 bytes long */
-                               if (len < 5)  {
-                                       ND_PRINT((ndo, "ERROR: option %u len %u < 5 bytes",
-                                           TAG_CLASSLESS_STATIC_RT, len));
+                               if (len < 5) {
+                                       ND_PRINT("[ERROR: length < 5 bytes]");
                                        bp += len;
                                        len = 0;
                                        break;
                                }
                                while (len > 0) {
                                        if (!first)
-                                               ND_PRINT((ndo, ","));
-                                       mask_width = *bp++;
+                                               ND_PRINT(",");
+                                       mask_width = GET_U_1(bp);
+                                       bp++;
                                        len--;
                                        /* mask_width <= 32 */
                                        if (mask_width > 32) {
-                                               ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]",  mask_width));
+                                               ND_PRINT("[ERROR: Mask width (%u) > 32]", mask_width);
                                                bp += len;
                                                len = 0;
                                                break;
@@ -724,36 +918,80 @@ rfc1048_print(netdissect_options *ndo,
                                        significant_octets = (mask_width + 7) / 8;
                                        /* significant octets + router(4) */
                                        if (len < significant_octets + 4) {
-                                               ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]",  len, significant_octets + 4));
+                                               ND_PRINT("[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4);
                                                bp += len;
                                                len = 0;
                                                break;
                                        }
-                                       ND_PRINT((ndo, "("));
+                                       ND_PRINT("(");
                                        if (mask_width == 0)
-                                               ND_PRINT((ndo, "default"));
+                                               ND_PRINT("default");
                                        else {
                                                for (i = 0; i < significant_octets ; i++) {
                                                        if (i > 0)
-                                                               ND_PRINT((ndo, "."));
-                                                       ND_PRINT((ndo, "%d", *bp++));
+                                                               ND_PRINT(".");
+                                                       ND_PRINT("%u",
+                                                                GET_U_1(bp));
+                                                       bp++;
                                                }
                                                for (i = significant_octets ; i < 4 ; i++)
-                                                       ND_PRINT((ndo, ".0"));
-                                               ND_PRINT((ndo, "/%d", mask_width));
+                                                       ND_PRINT(".0");
+                                               ND_PRINT("/%u", mask_width);
                                        }
-                                       memcpy((char *)&ul, (const char *)bp, sizeof(ul));
-                                       ND_PRINT((ndo, ":%s)", ipaddr_string(ndo, &ul)));
-                                       bp += sizeof(ul);
+                                       ND_PRINT(":%s)", GET_IPADDR_STRING(bp));
+                                       bp += 4;
                                        len -= (significant_octets + 4);
                                        first = 0;
                                }
-                       }
-                       break;
+                               break;
+                           }
+
+                       case TAG_USER_CLASS:
+                           {
+                               u_int suboptnumber = 1;
+
+                               first = 1;
+                               if (len < 2) {
+                                       ND_PRINT("[ERROR: length < 2 bytes]");
+                                       bp += len;
+                                       len = 0;
+                                       break;
+                               }
+                               while (len > 0) {
+                                       suboptlen = GET_U_1(bp);
+                                       bp++;
+                                       len--;
+                                       ND_PRINT("\n\t      ");
+                                       ND_PRINT("instance#%u: ", suboptnumber);
+                                       if (suboptlen == 0) {
+                                               ND_PRINT("[ERROR: suboption length must be non-zero]");
+                                               bp += len;
+                                               len = 0;
+                                               break;
+                                       }
+                                       if (len < suboptlen) {
+                                               ND_PRINT("[ERROR: invalid option]");
+                                               bp += len;
+                                               len = 0;
+                                               break;
+                                       }
+                                       ND_PRINT("\"");
+                                       if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) {
+                                               ND_PRINT("\"");
+                                               goto trunc;
+                                       }
+                                       ND_PRINT("\"");
+                                       ND_PRINT(", length %u", suboptlen);
+                                       suboptnumber++;
+                                       len -= suboptlen;
+                                       bp += suboptlen;
+                               }
+                               break;
+                           }
 
                        default:
-                               ND_PRINT((ndo, "[unknown special tag %u, size %u]",
-                                   tag, len));
+                               ND_PRINT("[unknown special tag %u, size %u]",
+                                         tag, len);
                                bp += len;
                                len = 0;
                                break;
@@ -762,34 +1000,36 @@ rfc1048_print(netdissect_options *ndo,
                }
                /* Data left over? */
                if (len) {
-                       ND_PRINT((ndo, "\n\t  trailing data length %u", len));
+                       ND_PRINT("\n\t  trailing data length %u", len);
                        bp += len;
                }
        }
        return;
 trunc:
-       ND_PRINT((ndo, "|[rfc1048]"));
+       nd_print_trunc(ndo);
 }
 
+#define PRINTCMUADDR(m, s) { ND_TCHECK_4(cmu->m); \
+    if (GET_IPV4_TO_NETWORK_ORDER(cmu->m) != 0) \
+       ND_PRINT(" %s:%s", s, GET_IPADDR_STRING(cmu->m)); }
+
 static void
 cmu_print(netdissect_options *ndo,
-          register const u_char *bp)
+         const u_char *bp)
 {
-       register const struct cmu_vend *cmu;
-
-#define PRINTCMUADDR(m, s) { ND_TCHECK(cmu->m); \
-    if (cmu->m.s_addr != 0) \
-       ND_PRINT((ndo, " %s:%s", s, ipaddr_string(ndo, &cmu->m.s_addr))); }
+       const struct cmu_vend *cmu;
+       uint8_t v_flags;
 
-       ND_PRINT((ndo, " vend-cmu"));
+       ND_PRINT(" vend-cmu");
        cmu = (const struct cmu_vend *)bp;
 
        /* Only print if there are unknown bits */
-       ND_TCHECK(cmu->v_flags);
-       if ((cmu->v_flags & ~(VF_SMASK)) != 0)
-               ND_PRINT((ndo, " F:0x%x", cmu->v_flags));
+       ND_TCHECK_4(cmu->v_flags);
+       v_flags = GET_U_1(cmu->v_flags);
+       if ((v_flags & ~(VF_SMASK)) != 0)
+               ND_PRINT(" F:0x%x", v_flags);
        PRINTCMUADDR(v_dgate, "DG");
-       PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
+       PRINTCMUADDR(v_smask, v_flags & VF_SMASK ? "SM" : "SM*");
        PRINTCMUADDR(v_dns1, "NS1");
        PRINTCMUADDR(v_dns2, "NS2");
        PRINTCMUADDR(v_ins1, "IEN1");
@@ -799,10 +1039,11 @@ cmu_print(netdissect_options *ndo,
        return;
 
 trunc:
-       ND_PRINT((ndo, "%s", tstr));
-#undef PRINTCMUADDR
+       nd_print_trunc(ndo);
 }
 
+#undef PRINTCMUADDR
+
 static char *
 client_fqdn_flags(u_int flags)
 {