X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/306c2a0384af923a73bf234f3c8bc186ceff0b58..4c683712d4b483b43f16d41d09ec6232cbc917ca:/print-bootp.c diff --git a/print-bootp.c b/print-bootp.c index 264a016b..d84ba6f8 100644 --- a/print-bootp.c +++ b/print-bootp.c @@ -21,9 +21,7 @@ /* \summary: BOOTP and IPv4 DHCP printer */ -#ifdef HAVE_CONFIG_H #include -#endif #include "netdissect-stdinc.h" @@ -147,7 +145,7 @@ struct bootp { #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_SMTP_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) @@ -193,34 +191,30 @@ struct bootp { /* RFC 3442 */ #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121) #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249) +/* RFC8572 */ +#define TAG_SZTP_REDIRECT ((uint8_t) 143) /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150) -/* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */ +/* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml */ #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_AGENT_MASK ((uint8_t) 84) #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_LAST_TRANSACTION_TIME ((uint8_t) 91) +#define TAG_ASSOCIATED_IP ((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) -#define TAG_6OVER4 ((uint8_t) 96) /* RFC 4833, TZ codes */ -#define TAG_TZ_PCODE ((uint8_t) 100) -#define TAG_TZ_TCODE ((uint8_t) 101) -#define TAG_IPX_COMPAT ((uint8_t) 110) +#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_FAILOVER ((uint8_t) 115) -#define TAG_EXTENDED_REQUEST ((uint8_t) 126) -#define TAG_EXTENDED_OPTION ((uint8_t) 127) #define TAG_MUDURL ((uint8_t) 161) /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */ @@ -232,6 +226,12 @@ struct bootp { #define DHCPNAK 6 #define DHCPRELEASE 7 #define DHCPINFORM 8 +/* Defined in RFC4388 */ +#define DHCPLEASEQUERY 10 +#define DHCPLEASEUNASSIGNED 11 +#define DHCPLEASEUNKNOWN 12 +#define DHCPLEASEACTIVE 13 + /* * "vendor" data permitted for CMU bootp clients. @@ -289,16 +289,13 @@ bootp_print(netdissect_options *ndo, ndo->ndo_protocol = "bootp"; bp = (const struct bootp *)cp; - ND_TCHECK_1(bp->bp_op); bp_op = GET_U_1(bp->bp_op); ND_PRINT("BOOTP/DHCP, %s", tok2str(bootp_op_values, "unknown (0x%02x)", bp_op)); - ND_TCHECK_1(bp->bp_hlen); 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_TCHECK_6(bp->bp_chaddr); + if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN && bp_op == BOOTPREQUEST) { ND_PRINT(" from %s", GET_ETHERADDR_STRING(bp->bp_chaddr)); } @@ -314,7 +311,7 @@ bootp_print(netdissect_options *ndo, ND_PRINT(", htype %u", bp_htype); /* The usual length for 10Mb Ethernet address is 6 bytes */ - if (bp_htype != 1 || bp_hlen != 6) + if (bp_htype != 1 || bp_hlen != MAC_ADDR_LEN) ND_PRINT(", hlen %u", bp_hlen); /* Only print interesting fields */ @@ -325,40 +322,33 @@ bootp_print(netdissect_options *ndo, if (GET_BE_U_2(bp->bp_secs)) ND_PRINT(", secs %u", GET_BE_U_2(bp->bp_secs)); - ND_TCHECK_2(bp->bp_flags); ND_PRINT(", Flags [%s]", bittok2str(bootp_flag_values, "none", GET_BE_U_2(bp->bp_flags))); if (ndo->ndo_vflag > 1) ND_PRINT(" (0x%04x)", GET_BE_U_2(bp->bp_flags)); /* Client's ip address */ - ND_TCHECK_4(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_4(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_4(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_4(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_htype == 1 && bp_hlen == 6) { - ND_TCHECK_6(bp->bp_chaddr); + if (bp_htype == 1 && bp_hlen == MAC_ADDR_LEN) { ND_PRINT("\n\t Client-Ethernet-Address %s", GET_ETHERADDR_STRING(bp->bp_chaddr)); } - ND_TCHECK_1(bp->bp_sname); /* check first char only */ - if (GET_U_1(bp->bp_sname)) { + 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) { @@ -368,8 +358,7 @@ bootp_print(netdissect_options *ndo, } ND_PRINT("\""); } - ND_TCHECK_1(bp->bp_file); /* check first char only */ - if (GET_U_1(bp->bp_file)) { + 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) { @@ -405,9 +394,9 @@ trunc: * The first character specifies the format to print: * i - ip address (32 bits) * p - ip address pairs (32 bits + 32 bits) - * l - long (32 bits) - * L - unsigned long (32 bits) - * s - short (16 bits) + * l - unsigned longs (32 bits) + * L - longs (32 bits) + * s - unsigned shorts (16 bits) * b - period-separated decimal bytes (variable length) * x - colon-separated hex bytes (variable length) * a - ASCII string (variable length) @@ -472,7 +461,7 @@ static const struct tok tag2str[] = { { TAG_NIS_P_DOMAIN, "sN+D" }, { TAG_NIS_P_SERVERS, "iN+S" }, { TAG_MOBILE_HOME, "iMH" }, - { TAG_SMPT_SERVER, "iSMTP" }, + { TAG_SMTP_SERVER, "iSMTP" }, { TAG_POP3_SERVER, "iPOP3" }, { TAG_NNTP_SERVER, "iNNTP" }, { TAG_WWW_SERVER, "iWWW" }, @@ -510,6 +499,8 @@ static const struct tok tag2str[] = { /* RFC 3442 */ { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" }, { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" }, +/* RFC 8572 */ + { TAG_SZTP_REDIRECT, "$SZTP-Redirect" }, /* RFC 5859 - TFTP Server Address Option for DHCPv4 */ { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" }, /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options */ @@ -517,31 +508,23 @@ static const struct tok tag2str[] = { { TAG_CLIENT_FQDN, "$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' */ - { TAG_VINES_SERVERS, "iVINES" }, - { TAG_SERVER_RANK, "sRANK" }, + { TAG_CLIENT_LAST_TRANSACTION_TIME, "LLast-Transaction-Time" }, + { TAG_ASSOCIATED_IP, "iAssociated-IP" }, { TAG_CLIENT_ARCH, "sARCH" }, { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */ { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */ { TAG_LDAP_URL, "aLDAP" }, - { TAG_6OVER4, "i6o4" }, - { TAG_TZ_PCODE, "aPOSIX-TZ" }, - { TAG_TZ_TCODE, "aTZ-Name" }, - { 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' */ { TAG_MUDURL, "aMUD-URL" }, { 0, NULL } }; -/* 2-byte extended tags */ -static const struct tok xtag2str[] = { - { 0, NULL } -}; /* DHCP "options overload" types */ static const struct tok oo2str[] = { @@ -572,14 +555,18 @@ static const struct tok arp2str[] = { }; static const struct tok dhcp_msg_values[] = { - { DHCPDISCOVER, "Discover" }, - { DHCPOFFER, "Offer" }, - { DHCPREQUEST, "Request" }, - { DHCPDECLINE, "Decline" }, - { DHCPACK, "ACK" }, - { DHCPNAK, "NACK" }, - { DHCPRELEASE, "Release" }, - { DHCPINFORM, "Inform" }, + { DHCPDISCOVER, "Discover" }, + { DHCPOFFER, "Offer" }, + { DHCPREQUEST, "Request" }, + { DHCPDECLINE, "Decline" }, + { DHCPACK, "ACK" }, + { DHCPNAK, "NACK" }, + { DHCPRELEASE, "Release" }, + { DHCPINFORM, "Inform" }, + { DHCPLEASEQUERY, "LeaseQuery" }, + { DHCPLEASEUNASSIGNED, "LeaseUnassigned" }, + { DHCPLEASEUNKNOWN, "LeaseUnknown" }, + { DHCPLEASEACTIVE, "LeaseActive" }, { 0, NULL } }; @@ -619,28 +606,18 @@ rfc1048_print(netdissect_options *ndo, continue; if (tag == TAG_END && ndo->ndo_vflag < 3) return; - if (tag == TAG_EXTENDED_OPTION) { - ND_TCHECK_2(bp + 1); - tag = GET_BE_U_2(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_TCHECK_1(bp); len = GET_U_1(bp); bp++; } - ND_PRINT("\n\t %s Option %u, length %u%s", cp, tag, len, + ND_PRINT("\n\t %s (%u), length %u%s", cp, tag, len, len > 0 ? ": " : ""); if (tag == TAG_PAD && ndo->ndo_vflag > 2) { @@ -666,35 +643,20 @@ rfc1048_print(netdissect_options *ndo, if (tag == TAG_PARM_REQUEST) { idx = 0; while (len > 0) { - cp = tok2str(tag2str, "?Option %u", - GET_U_1(bp)); + uint8_t innertag = GET_U_1(bp); bp++; len--; + cp = tok2str(tag2str, "?Unknown", innertag); if (idx % 4 == 0) ND_PRINT("\n\t "); else ND_PRINT(", "); - ND_PRINT("%s", cp + 1); + ND_PRINT("%s (%u)", cp + 1, innertag); idx++; } continue; } - if (tag == TAG_EXTENDED_REQUEST) { - first = 1; - while (len > 1) { - cp = tok2str(xtag2str, "?xT%u", - GET_BE_U_2(bp)); - bp += 2; - len -= 2; - if (!first) - ND_PRINT("+"); - ND_PRINT("%s", cp + 1); - first = 0; - } - continue; - } - /* Print data */ if (c == '?') { /* Base default formats for unknown tags on data size */ @@ -755,7 +717,7 @@ rfc1048_print(netdissect_options *ndo, break; case 's': - /* shorts */ + /* unsigned shorts */ while (len >= 2) { if (!first) ND_PRINT(","); @@ -816,7 +778,7 @@ rfc1048_print(netdissect_options *ndo, case TAG_NETBIOS_NODE: /* this option should be at least 1 byte long */ if (len < 1) { - ND_PRINT("ERROR: length < 1 bytes"); + ND_PRINT("[ERROR: length < 1 bytes]"); break; } tag = GET_U_1(bp); @@ -828,7 +790,7 @@ rfc1048_print(netdissect_options *ndo, case TAG_OPT_OVERLOAD: /* this option should be at least 1 byte long */ if (len < 1) { - ND_PRINT("ERROR: length < 1 bytes"); + ND_PRINT("[ERROR: length < 1 bytes]"); break; } tag = GET_U_1(bp); @@ -840,12 +802,16 @@ rfc1048_print(netdissect_options *ndo, case TAG_CLIENT_FQDN: /* this option should be at least 3 bytes long */ if (len < 3) { - ND_PRINT("ERROR: length < 3 bytes"); + ND_PRINT("[ERROR: length < 3 bytes]"); bp += len; len = 0; break; } - if (GET_U_1(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++; @@ -869,7 +835,7 @@ rfc1048_print(netdissect_options *ndo, /* this option should be at least 1 byte long */ if (len < 1) { - ND_PRINT("ERROR: length < 1 bytes"); + ND_PRINT("[ERROR: length < 1 bytes]"); break; } type = GET_U_1(bp); @@ -943,7 +909,7 @@ rfc1048_print(netdissect_options *ndo, /* this option should be at least 5 bytes long */ if (len < 5) { - ND_PRINT("ERROR: length < 5 bytes"); + ND_PRINT("[ERROR: length < 5 bytes]"); bp += len; len = 0; break; @@ -998,7 +964,7 @@ rfc1048_print(netdissect_options *ndo, first = 1; if (len < 2) { - ND_PRINT("ERROR: length < 2 bytes"); + ND_PRINT("[ERROR: length < 2 bytes]"); bp += len; len = 0; break; @@ -1010,13 +976,13 @@ rfc1048_print(netdissect_options *ndo, ND_PRINT("\n\t "); ND_PRINT("instance#%u: ", suboptnumber); if (suboptlen == 0) { - ND_PRINT("ERROR: suboption length must be non-zero"); + ND_PRINT("[ERROR: suboption length must be non-zero]"); bp += len; len = 0; break; } if (len < suboptlen) { - ND_PRINT("ERROR: invalid option"); + ND_PRINT("[ERROR: invalid option]"); bp += len; len = 0; break; @@ -1035,6 +1001,41 @@ rfc1048_print(netdissect_options *ndo, break; } + + case TAG_SZTP_REDIRECT: + /* as per https://datatracker.ietf.org/doc/html/rfc8572#section-8.3 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+ + | uri-length | URI | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...-+-+-+-+-+-+-+ + + * uri-length: 2 octets long; specifies the length of the URI data. + * URI: URI of the SZTP bootstrap server. + */ + while (len >= 2) { + uint16_t suboptlen2; + + suboptlen2 = GET_BE_U_2(bp); + bp += 2; + len -= 2; + ND_PRINT("\n\t "); + ND_PRINT("length %u: ", suboptlen2); + if (len < suboptlen2) { + ND_PRINT("length goes past end of option"); + bp += len; + len = 0; + break; + } + ND_PRINT("\""); + nd_printjn(ndo, bp, suboptlen2); + ND_PRINT("\""); + len -= suboptlen2; + bp += suboptlen2; + } + if (len != 0) { + ND_PRINT("[ERROR: length < 2 bytes]"); + } + break; + default: ND_PRINT("[unknown special tag %u, size %u]", tag, len);