X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ea0d29f7436f5a919d16009790c9b38c2c86e96f..c793dbef549f0c7bad09daa33e0b4bf5d1f62f04:/print-bootp.c diff --git a/print-bootp.c b/print-bootp.c index f84b77ca..227ed410 100644 --- a/print-bootp.c +++ b/print-bootp.c @@ -29,6 +29,7 @@ #include +#define ND_LONGJMP_FROM_TCHECK #include "netdissect.h" #include "addrtoname.h" #include "extract.h" @@ -193,6 +194,8 @@ 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) /* https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml */ @@ -210,8 +213,8 @@ struct bootp { #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_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) @@ -260,9 +263,16 @@ struct cmu_vend { #define CLIENT_FQDN_FLAGS_N 0x08 /* end of original bootp.h */ +static const struct tok fqdn_flags_bm[] = { + { CLIENT_FQDN_FLAGS_S, "S" }, + { CLIENT_FQDN_FLAGS_O, "O" }, + { CLIENT_FQDN_FLAGS_E, "E" }, + { CLIENT_FQDN_FLAGS_N, "N" }, + { 0, NULL } +}; + 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" }, @@ -351,20 +361,20 @@ bootp_print(netdissect_options *ndo, 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) { + NULL) == 0) { + /* Within the buffer, but not NUL-terminated. */ ND_PRINT("\""); - nd_print_trunc(ndo); - return; + goto invalid; } ND_PRINT("\""); } 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) { + NULL) == 0) { + /* Ditto. */ ND_PRINT("\""); - nd_print_trunc(ndo); - return; + goto invalid; } ND_PRINT("\""); } @@ -384,10 +394,9 @@ bootp_print(netdissect_options *ndo, if (ul != 0) ND_PRINT("\n\t Vendor-#0x%x", ul); } - return; -trunc: - nd_print_trunc(ndo); +invalid: + nd_print_invalid(ndo); } /* @@ -499,6 +508,8 @@ 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 */ @@ -515,8 +526,8 @@ static const struct tok tag2str[] = { { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */ { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */ { TAG_LDAP_URL, "aLDAP" }, - { TAG_TZ_PCODE, "aPOSIX-TZ" }, - { TAG_TZ_TCODE, "aTZ-Name" }, + { TAG_TZ_PCODE, "aPOSIX-TZ" }, + { TAG_TZ_TCODE, "aTZ-Name" }, { TAG_NETINFO_PARENT, "iNI" }, { TAG_NETINFO_PARENT_TAG, "aNITAG" }, { TAG_URL, "aURL" }, @@ -671,10 +682,7 @@ rfc1048_print(netdissect_options *ndo, case 'a': /* ASCII strings */ ND_PRINT("\""); - if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) { - ND_PRINT("\""); - goto trunc; - } + nd_printjn(ndo, bp, len); ND_PRINT("\""); bp += len; len = 0; @@ -811,17 +819,14 @@ rfc1048_print(netdissect_options *ndo, } if (GET_U_1(bp) & 0x0f) ND_PRINT("[%s] ", - client_fqdn_flags(GET_U_1(bp))); + bittok2str_nosep(fqdn_flags_bm, "", (GET_U_1(bp)))); bp++; 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("\""); - if (nd_printn(ndo, bp, len - 3, ndo->ndo_snapend)) { - ND_PRINT("\""); - goto trunc; - } + nd_printjn(ndo, bp, len - 3); ND_PRINT("\""); bp += len - 3; len = 0; @@ -841,10 +846,7 @@ rfc1048_print(netdissect_options *ndo, len--; if (type == 0) { ND_PRINT("\""); - if (nd_printn(ndo, bp, len, ndo->ndo_snapend)) { - ND_PRINT("\""); - goto trunc; - } + nd_printjn(ndo, bp, len); ND_PRINT("\""); bp += len; len = 0; @@ -887,8 +889,7 @@ rfc1048_print(netdissect_options *ndo, case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */ case AGENT_SUBOPTION_REMOTE_ID: case AGENT_SUBOPTION_SUBSCRIBER_ID: - if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) - goto trunc; + nd_printjn(ndo, bp, suboptlen); break; default: @@ -986,10 +987,7 @@ rfc1048_print(netdissect_options *ndo, break; } ND_PRINT("\""); - if (nd_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) { - ND_PRINT("\""); - goto trunc; - } + nd_printjn(ndo, bp, suboptlen); ND_PRINT("\""); ND_PRINT(", length %u", suboptlen); suboptnumber++; @@ -999,6 +997,39 @@ 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) { + suboptlen = GET_BE_U_2(bp); + bp += 2; + len -= 2; + ND_PRINT("\n\t "); + ND_PRINT("length %u: ", suboptlen); + if (len < suboptlen) { + ND_PRINT("length goes past end of option"); + bp += len; + len = 0; + break; + } + ND_PRINT("\""); + nd_printjn(ndo, bp, suboptlen); + ND_PRINT("\""); + len -= suboptlen; + bp += suboptlen; + } + if (len != 0) { + ND_PRINT("[ERROR: length < 2 bytes]"); + } + break; + default: ND_PRINT("[unknown special tag %u, size %u]", tag, len); @@ -1014,9 +1045,6 @@ rfc1048_print(netdissect_options *ndo, bp += len; } } - return; -trunc: - nd_print_trunc(ndo); } #define PRINTCMUADDR(m, s) { ND_TCHECK_4(cmu->m); \ @@ -1046,29 +1074,6 @@ cmu_print(netdissect_options *ndo, PRINTCMUADDR(v_ins2, "IEN2"); PRINTCMUADDR(v_ts1, "TS1"); PRINTCMUADDR(v_ts2, "TS2"); - return; - -trunc: - nd_print_trunc(ndo); } #undef PRINTCMUADDR - -static char * -client_fqdn_flags(u_int flags) -{ - static char buf[8+1]; - int i = 0; - - if (flags & CLIENT_FQDN_FLAGS_S) - buf[i++] = 'S'; - if (flags & CLIENT_FQDN_FLAGS_O) - buf[i++] = 'O'; - if (flags & CLIENT_FQDN_FLAGS_E) - buf[i++] = 'E'; - if (flags & CLIENT_FQDN_FLAGS_N) - buf[i++] = 'N'; - buf[i] = '\0'; - - return buf; -}