/* $NetBSD: mdig.c,v 1.3.4.3 2024/02/29 12:33:02 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define CHECK(str, x) \ { \ if ((x) != ISC_R_SUCCESS) { \ fprintf(stderr, "mdig: %s failed with %s\n", (str), \ isc_result_totext(x)); \ exit(-1); \ } \ } #define RUNCHECK(x) RUNTIME_CHECK((x) == ISC_R_SUCCESS) #define ADD_STRING(b, s) \ { \ if (strlen(s) >= isc_buffer_availablelength(b)) \ return ((ISC_R_NOSPACE)); \ else \ isc_buffer_putstr(b, s); \ } #define MXNAME (DNS_NAME_MAXTEXT + 1) #define COMMSIZE 0xffff #define OUTPUTBUF 32767 #define MAXPORT 0xffff #define PORT 53 #define MAXTIMEOUT 0xffff #define TCPTIMEOUT 10 #define UDPTIMEOUT 5 #define MAXTRIES 0xffffffff static isc_mem_t *mctx = NULL; static dns_requestmgr_t *requestmgr = NULL; static const char *batchname = NULL; static FILE *batchfp = NULL; static bool burst = false; static bool have_ipv4 = false; static bool have_ipv6 = false; static bool have_src = false; static bool tcp_mode = false; static bool besteffort = true; static bool display_short_form = false; static bool display_headers = true; static bool display_comments = true; static int display_rrcomments = 0; static bool display_ttlunits = true; static bool display_ttl = true; static bool display_class = true; static bool display_crypto = true; static bool display_multiline = false; static bool display_question = true; static bool display_answer = true; static bool display_authority = true; static bool display_additional = true; static bool display_unknown_format = false; static bool yaml = false; static bool continue_on_error = false; static uint32_t display_splitwidth = 0xffffffff; static isc_sockaddr_t srcaddr; static char *server = NULL; static isc_sockaddr_t dstaddr; static in_port_t port = 53; static unsigned char cookie_secret[33]; static int onfly = 0; static char hexcookie[81]; struct query { char textname[MXNAME]; /*% Name we're going to be * looking up */ bool recurse; bool have_aaonly; bool have_adflag; bool have_cdflag; bool have_zflag; bool dnssec; bool expire; bool send_cookie; char *cookie; bool nsid; dns_rdatatype_t rdtype; dns_rdataclass_t rdclass; uint16_t udpsize; int16_t edns; dns_ednsopt_t *ednsopts; unsigned int ednsoptscnt; unsigned int ednsflags; isc_sockaddr_t *ecs_addr; unsigned int timeout; unsigned int udptimeout; unsigned int udpretries; ISC_LINK(struct query) link; }; static struct query default_query; static ISC_LIST(struct query) queries; #define EDNSOPTS 100U /*% opcode text */ static const char *const opcodetext[] = { "QUERY", "IQUERY", "STATUS", "RESERVED3", "NOTIFY", "UPDATE", "RESERVED6", "RESERVED7", "RESERVED8", "RESERVED9", "RESERVED10", "RESERVED11", "RESERVED12", "RESERVED13", "RESERVED14", "RESERVED15" }; /*% return code text */ static const char *const rcodetext[] = { "NOERROR", "FORMERR", "SERVFAIL", "NXDOMAIN", "NOTIMP", "REFUSED", "YXDOMAIN", "YXRRSET", "NXRRSET", "NOTAUTH", "NOTZONE", "RESERVED11", "RESERVED12", "RESERVED13", "RESERVED14", "RESERVED15", "BADVERS" }; /*% safe rcodetext[] */ static char * rcode_totext(dns_rcode_t rcode) { static char buf[sizeof("?65535")]; union { const char *consttext; char *deconsttext; } totext; if (rcode >= (sizeof(rcodetext) / sizeof(rcodetext[0]))) { snprintf(buf, sizeof(buf), "?%u", rcode); totext.deconsttext = buf; } else { totext.consttext = rcodetext[rcode]; } return (totext.deconsttext); } /* receive response event handler */ static void recvresponse(isc_task_t *task, isc_event_t *event) { dns_requestevent_t *reqev = (dns_requestevent_t *)event; isc_result_t result; dns_message_t *query = NULL, *response = NULL; unsigned int parseflags = 0; isc_buffer_t *msgbuf = NULL, *buf = NULL; unsigned int len = OUTPUTBUF; dns_master_style_t *style = NULL; unsigned int styleflags = 0; dns_messagetextflag_t flags; UNUSED(task); REQUIRE(reqev != NULL); query = reqev->ev_arg; if (reqev->result != ISC_R_SUCCESS) { fprintf(stderr, "response failed with %s\n", isc_result_totext(reqev->result)); if (continue_on_error) { goto cleanup; } else { exit(-1); } } dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &response); parseflags |= DNS_MESSAGEPARSE_PRESERVEORDER; if (besteffort) { parseflags |= DNS_MESSAGEPARSE_BESTEFFORT; parseflags |= DNS_MESSAGEPARSE_IGNORETRUNCATION; } msgbuf = dns_request_getanswer(reqev->request); result = dns_request_getresponse(reqev->request, response, parseflags); CHECK("dns_request_getresponse", result); styleflags |= DNS_STYLEFLAG_REL_OWNER; if (yaml) { styleflags |= DNS_STYLEFLAG_YAML; response->indent.string = " "; response->indent.count = 3; } else { if (display_comments) { styleflags |= DNS_STYLEFLAG_COMMENT; } if (display_unknown_format) { styleflags |= DNS_STYLEFLAG_UNKNOWNFORMAT; } if (display_rrcomments > 0) { styleflags |= DNS_STYLEFLAG_RRCOMMENT; } if (display_ttlunits) { styleflags |= DNS_STYLEFLAG_TTL_UNITS; } if (!display_ttl) { styleflags |= DNS_STYLEFLAG_NO_TTL; } if (!display_class) { styleflags |= DNS_STYLEFLAG_NO_CLASS; } if (!display_crypto) { styleflags |= DNS_STYLEFLAG_NOCRYPTO; } if (display_multiline) { styleflags |= DNS_STYLEFLAG_OMIT_OWNER; styleflags |= DNS_STYLEFLAG_OMIT_CLASS; styleflags |= DNS_STYLEFLAG_REL_DATA; styleflags |= DNS_STYLEFLAG_OMIT_TTL; styleflags |= DNS_STYLEFLAG_TTL; styleflags |= DNS_STYLEFLAG_MULTILINE; styleflags |= DNS_STYLEFLAG_COMMENT; /* Turn on rrcomments unless explicitly disabled */ if (display_rrcomments >= 0) { styleflags |= DNS_STYLEFLAG_RRCOMMENT; } } } if (display_multiline || (!display_ttl && !display_class)) { result = dns_master_stylecreate(&style, styleflags, 24, 24, 24, 32, 80, 8, display_splitwidth, mctx); } else if (!display_ttl || !display_class) { result = dns_master_stylecreate(&style, styleflags, 24, 24, 32, 40, 80, 8, display_splitwidth, mctx); } else { result = dns_master_stylecreate(&style, styleflags, 24, 32, 40, 48, 80, 8, display_splitwidth, mctx); } CHECK("dns_master_stylecreate2", result); flags = 0; if (!display_headers) { flags |= DNS_MESSAGETEXTFLAG_NOHEADERS; flags |= DNS_MESSAGETEXTFLAG_NOCOMMENTS; } if (!display_comments) { flags |= DNS_MESSAGETEXTFLAG_NOCOMMENTS; } isc_buffer_allocate(mctx, &buf, len); if (yaml) { char sockstr[ISC_SOCKADDR_FORMATSIZE]; uint16_t sport; char *hash; int pf; printf("-\n"); printf(" type: MESSAGE\n"); printf(" message:\n"); if (((response->flags & DNS_MESSAGEFLAG_RD) != 0) && ((response->flags & DNS_MESSAGEFLAG_RA) != 0)) { printf(" type: RECURSIVE_RESPONSE\n"); } else { printf(" type: AUTH_RESPONSE\n"); } printf(" message_size: %ub\n", isc_buffer_usedlength(msgbuf)); pf = isc_sockaddr_pf(&dstaddr); if (pf == PF_INET || pf == PF_INET6) { printf(" socket_family: %s\n", pf == PF_INET ? "INET" : "INET6"); printf(" socket_protocol: %s\n", tcp_mode ? "TCP" : "UDP"); sport = isc_sockaddr_getport(&dstaddr); isc_sockaddr_format(&dstaddr, sockstr, sizeof(sockstr)); hash = strchr(sockstr, '#'); if (hash != NULL) { *hash = '\0'; } printf(" response_address: \"%s\"\n", sockstr); printf(" response_port: %u\n", sport); } if (have_src) { sport = isc_sockaddr_getport(&srcaddr); isc_sockaddr_format(&srcaddr, sockstr, sizeof(sockstr)); hash = strchr(sockstr, '#'); if (hash != NULL) { *hash = '\0'; } printf(" query_address: \"%s\"\n", sockstr); printf(" query_port: %u\n", sport); } printf(" %s:\n", "response_message_data"); result = dns_message_headertotext(response, style, flags, buf); CHECK("dns_message_headertotext", result); } else if (display_comments && !display_short_form) { printf(";; Got answer:\n"); if (display_headers) { printf(";; ->>HEADER<<- opcode: %s, status: %s, " "id: %u\n", opcodetext[response->opcode], rcode_totext(response->rcode), response->id); printf(";; flags:"); if ((response->flags & DNS_MESSAGEFLAG_QR) != 0) { printf(" qr"); } if ((response->flags & DNS_MESSAGEFLAG_AA) != 0) { printf(" aa"); } if ((response->flags & DNS_MESSAGEFLAG_TC) != 0) { printf(" tc"); } if ((response->flags & DNS_MESSAGEFLAG_RD) != 0) { printf(" rd"); } if ((response->flags & DNS_MESSAGEFLAG_RA) != 0) { printf(" ra"); } if ((response->flags & DNS_MESSAGEFLAG_AD) != 0) { printf(" ad"); } if ((response->flags & DNS_MESSAGEFLAG_CD) != 0) { printf(" cd"); } if ((response->flags & 0x0040U) != 0) { printf("; MBZ: 0x4"); } printf("; QUERY: %u, ANSWER: %u, " "AUTHORITY: %u, ADDITIONAL: %u\n", response->counts[DNS_SECTION_QUESTION], response->counts[DNS_SECTION_ANSWER], response->counts[DNS_SECTION_AUTHORITY], response->counts[DNS_SECTION_ADDITIONAL]); if ((response->flags & DNS_MESSAGEFLAG_RD) != 0 && (response->flags & DNS_MESSAGEFLAG_RA) == 0) { printf(";; WARNING: recursion requested " "but not available\n"); } } } repopulate_buffer: if (display_comments && display_headers && !display_short_form) { result = dns_message_pseudosectiontotext( response, DNS_PSEUDOSECTION_OPT, style, flags, buf); if (result == ISC_R_NOSPACE) { buftoosmall: len += OUTPUTBUF; isc_buffer_free(&buf); isc_buffer_allocate(mctx, &buf, len); goto repopulate_buffer; } CHECK("dns_message_pseudosectiontotext", result); } if (display_question && display_headers && !display_short_form) { result = dns_message_sectiontotext( response, DNS_SECTION_QUESTION, style, flags, buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_message_sectiontotext", result); } if (display_answer && !display_short_form) { result = dns_message_sectiontotext(response, DNS_SECTION_ANSWER, style, flags, buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_message_sectiontotext", result); } else if (display_answer) { dns_name_t *name; dns_rdataset_t *rdataset; isc_result_t loopresult; dns_name_t empty_name; dns_rdata_t rdata = DNS_RDATA_INIT; unsigned int answerstyleflags = 0; if (!display_crypto) { answerstyleflags |= DNS_STYLEFLAG_NOCRYPTO; } if (display_unknown_format) { answerstyleflags |= DNS_STYLEFLAG_UNKNOWNFORMAT; } dns_name_init(&empty_name, NULL); result = dns_message_firstname(response, DNS_SECTION_ANSWER); if (result != ISC_R_NOMORE) { CHECK("dns_message_firstname", result); } for (;;) { if (result == ISC_R_NOMORE) { break; } CHECK("dns_message_nextname", result); name = NULL; dns_message_currentname(response, DNS_SECTION_ANSWER, &name); for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL; rdataset = ISC_LIST_NEXT(rdataset, link)) { loopresult = dns_rdataset_first(rdataset); while (loopresult == ISC_R_SUCCESS) { dns_rdataset_current(rdataset, &rdata); result = dns_rdata_tofmttext( &rdata, NULL, answerstyleflags, 0, 60, " ", buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_rdata_tofmttext", result); loopresult = dns_rdataset_next(rdataset); dns_rdata_reset(&rdata); if (strlen("\n") >= isc_buffer_availablelength(buf)) { goto buftoosmall; } isc_buffer_putstr(buf, "\n"); } } result = dns_message_nextname(response, DNS_SECTION_ANSWER); } } if (display_authority && !display_short_form) { result = dns_message_sectiontotext( response, DNS_SECTION_AUTHORITY, style, flags, buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_message_sectiontotext", result); } if (display_additional && !display_short_form) { result = dns_message_sectiontotext( response, DNS_SECTION_ADDITIONAL, style, flags, buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_message_sectiontotext", result); } if (display_additional && !display_short_form && display_headers) { /* * Only print the signature on the first record. */ result = dns_message_pseudosectiontotext( response, DNS_PSEUDOSECTION_TSIG, style, flags, buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_message_pseudosectiontotext", result); result = dns_message_pseudosectiontotext( response, DNS_PSEUDOSECTION_SIG0, style, flags, buf); if (result == ISC_R_NOSPACE) { goto buftoosmall; } CHECK("dns_message_pseudosectiontotext", result); } if (display_headers && display_comments && !display_short_form && !yaml) { printf("\n"); } printf("%.*s", (int)isc_buffer_usedlength(buf), (char *)isc_buffer_base(buf)); isc_buffer_free(&buf); cleanup: fflush(stdout); if (style != NULL) { dns_master_styledestroy(&style, mctx); } if (query != NULL) { dns_message_detach(&query); } if (response != NULL) { dns_message_detach(&response); } dns_request_destroy(&reqev->request); isc_event_free(&event); if (--onfly == 0) { isc_app_shutdown(); } return; } /*% * Add EDNS0 option record to a message. Currently, the only supported * options are UDP buffer size, the DO bit, and EDNS options * (e.g., NSID, COOKIE, client-subnet) */ static void add_opt(dns_message_t *msg, uint16_t udpsize, uint16_t edns, unsigned int flags, dns_ednsopt_t *opts, size_t count) { dns_rdataset_t *rdataset = NULL; isc_result_t result; result = dns_message_buildopt(msg, &rdataset, edns, udpsize, flags, opts, count); CHECK("dns_message_buildopt", result); result = dns_message_setopt(msg, rdataset); CHECK("dns_message_setopt", result); } static void compute_cookie(unsigned char *cookie, size_t len) { /* XXXMPA need to fix, should be per server. */ INSIST(len >= 8U); memmove(cookie, cookie_secret, 8); } static isc_result_t sendquery(struct query *query, isc_task_t *task) { dns_request_t *request = NULL; dns_message_t *message = NULL; dns_name_t *qname = NULL; dns_rdataset_t *qrdataset = NULL; isc_result_t result; dns_fixedname_t queryname; isc_buffer_t buf; unsigned int options; onfly++; dns_fixedname_init(&queryname); isc_buffer_init(&buf, query->textname, strlen(query->textname)); isc_buffer_add(&buf, strlen(query->textname)); result = dns_name_fromtext(dns_fixedname_name(&queryname), &buf, dns_rootname, 0, NULL); CHECK("dns_name_fromtext", result); dns_message_create(mctx, DNS_MESSAGE_INTENTRENDER, &message); message->opcode = dns_opcode_query; if (query->recurse) { message->flags |= DNS_MESSAGEFLAG_RD; } if (query->have_aaonly) { message->flags |= DNS_MESSAGEFLAG_AA; } if (query->have_adflag) { message->flags |= DNS_MESSAGEFLAG_AD; } if (query->have_cdflag) { message->flags |= DNS_MESSAGEFLAG_CD; } if (query->have_zflag) { message->flags |= 0x0040U; } message->rdclass = query->rdclass; message->id = (unsigned short)(random() & 0xFFFF); result = dns_message_gettempname(message, &qname); CHECK("dns_message_gettempname", result); result = dns_message_gettemprdataset(message, &qrdataset); CHECK("dns_message_gettemprdataset", result); dns_name_clone(dns_fixedname_name(&queryname), qname); dns_rdataset_makequestion(qrdataset, query->rdclass, query->rdtype); ISC_LIST_APPEND(qname->list, qrdataset, link); dns_message_addname(message, qname, DNS_SECTION_QUESTION); if (query->udpsize > 0 || query->dnssec || query->edns > -1 || query->ecs_addr != NULL) { dns_ednsopt_t opts[EDNSOPTS + DNS_EDNSOPTIONS]; unsigned int flags; int i = 0; char ecsbuf[20]; unsigned char cookie[40]; if (query->udpsize == 0) { query->udpsize = 1232; } if (query->edns < 0) { query->edns = 0; } if (query->nsid) { INSIST(i < DNS_EDNSOPTIONS); opts[i].code = DNS_OPT_NSID; opts[i].length = 0; opts[i].value = NULL; i++; } if (query->ecs_addr != NULL) { uint8_t addr[16], family; uint32_t plen; struct sockaddr *sa; struct sockaddr_in *sin; struct sockaddr_in6 *sin6; size_t addrl; isc_buffer_t b; sa = &query->ecs_addr->type.sa; plen = query->ecs_addr->length; /* Round up prefix len to a multiple of 8 */ addrl = (plen + 7) / 8; INSIST(i < DNS_EDNSOPTIONS); opts[i].code = DNS_OPT_CLIENT_SUBNET; opts[i].length = (uint16_t)addrl + 4; CHECK("isc_buffer_allocate", result); isc_buffer_init(&b, ecsbuf, sizeof(ecsbuf)); if (sa->sa_family == AF_INET) { family = 1; sin = (struct sockaddr_in *)sa; memmove(addr, &sin->sin_addr, 4); if ((plen % 8) != 0) { addr[addrl - 1] &= ~0U << (8 - (plen % 8)); } } else { family = 2; sin6 = (struct sockaddr_in6 *)sa; memmove(addr, &sin6->sin6_addr, 16); } /* Mask off last address byte */ if (addrl > 0 && (plen % 8) != 0) { addr[addrl - 1] &= ~0U << (8 - (plen % 8)); } /* family */ isc_buffer_putuint16(&b, family); /* source prefix-length */ isc_buffer_putuint8(&b, plen); /* scope prefix-length */ isc_buffer_putuint8(&b, 0); /* address */ if (addrl > 0) { isc_buffer_putmem(&b, addr, (unsigned)addrl); } opts[i].value = (uint8_t *)ecsbuf; i++; } if (query->send_cookie) { INSIST(i < DNS_EDNSOPTIONS); opts[i].code = DNS_OPT_COOKIE; if (query->cookie != NULL) { isc_buffer_t b; isc_buffer_init(&b, cookie, sizeof(cookie)); result = isc_hex_decodestring(query->cookie, &b); CHECK("isc_hex_decodestring", result); opts[i].value = isc_buffer_base(&b); opts[i].length = isc_buffer_usedlength(&b); } else { compute_cookie(cookie, 8); opts[i].length = 8; opts[i].value = cookie; } i++; } if (query->expire) { INSIST(i < DNS_EDNSOPTIONS); opts[i].code = DNS_OPT_EXPIRE; opts[i].length = 0; opts[i].value = NULL; i++; } if (query->ednsoptscnt != 0) { memmove(&opts[i], query->ednsopts, sizeof(dns_ednsopt_t) * query->ednsoptscnt); i += query->ednsoptscnt; } flags = query->ednsflags; flags &= ~DNS_MESSAGEEXTFLAG_DO; if (query->dnssec) { flags |= DNS_MESSAGEEXTFLAG_DO; } add_opt(message, query->udpsize, query->edns, flags, opts, i); } options = 0; if (tcp_mode) { options |= DNS_REQUESTOPT_TCP; } request = NULL; result = dns_request_create( requestmgr, message, have_src ? &srcaddr : NULL, &dstaddr, options, NULL, query->timeout, query->udptimeout, query->udpretries, task, recvresponse, message, &request); CHECK("dns_request_create", result); return (ISC_R_SUCCESS); } static void sendqueries(isc_task_t *task, isc_event_t *event) { struct query *query = (struct query *)event->ev_arg; isc_event_free(&event); while (query != NULL) { struct query *next = ISC_LIST_NEXT(query, link); sendquery(query, task); query = next; } if (onfly == 0) { isc_app_shutdown(); } return; } noreturn static void usage(void); static void usage(void) { fprintf(stderr, "Usage: mdig @server {global-opt} host\n" " {local-opt} [ host {local-opt} [...]]\n" "\nUse \"mdig -h\" (or \"mdig -h | more\") " "for complete list of options\n"); exit(1); } /*% help */ static void help(void) { printf("Usage: mdig @server {global-opt} host\n" " {local-opt} [ host {local-opt} [...]]\n" "Where:\n" " anywhere opt is one of:\n" " -f filename (batch mode)\n" " -h (print help and exit)\n" " -v (print version and exit)\n" " global opt is one of:\n" " -4 (use IPv4 query transport " "only)\n" " -6 (use IPv6 query transport " "only)\n" " -b address[#port] (bind to source " "address/port)\n" " -p port (specify port number)\n" " -m (enable memory usage " "debugging)\n" " +[no]vc (TCP mode)\n" " +[no]tcp (TCP mode, alternate " "syntax)\n" " +[no]besteffort (Try to parse even " "illegal " "messages)\n" " +[no]cl (Control display of class " "in records)\n" " +[no]comments (Control display of " "comment lines)\n" " +[no]rrcomments (Control display of " "per-record " "comments)\n" " +[no]crypto (Control display of " "cryptographic " "fields in records)\n" " +[no]question (Control display of " "question)\n" " +[no]answer (Control display of " "answer)\n" " +[no]authority (Control display of " "authority)\n" " +[no]additional (Control display of " "additional)\n" " +[no]short (Disable everything " "except " "short\n" " form of answer)\n" " +[no]ttlid (Control display of ttls " "in records)\n" " +[no]ttlunits (Display TTLs in " "human-readable units)\n" " +[no]unknownformat (Print RDATA in RFC 3597 " "\"unknown\" format)\n" " +[no]all (Set or clear all display " "flags)\n" " +[no]multiline (Print records in an " "expanded format)\n" " +[no]split=## (Split hex/base64 fields " "into chunks)\n" " local opt is one of:\n" " -c class (specify query class)\n" " -t type (specify query type)\n" " -x dot-notation (shortcut for reverse " "lookups)\n" " +timeout=### (Set query timeout) " "[UDP=5,TCP=10]\n" " +udptimeout=### (Set timeout before UDP " "retry)\n" " +tries=### (Set number of UDP " "attempts) [3]\n" " +retry=### (Set number of UDP " "retries) [2]\n" " +bufsize=### (Set EDNS0 Max UDP packet " "size)\n" " +subnet=addr (Set edns-client-subnet " "option)\n" " +[no]edns[=###] (Set EDNS version) [0]\n" " +ednsflags=### (Set EDNS flag bits)\n" " +ednsopt=###[:value] (Send specified EDNS " "option)\n" " +noednsopt (Clear list of +ednsopt " "options)\n" " +[no]recurse (Recursive mode)\n" " +[no]aaonly (Set AA flag in query " "(+[no]aaflag))\n" " +[no]adflag (Set AD flag in query)\n" " +[no]cdflag (Set CD flag in query)\n" " +[no]zflag (Set Z flag in query)\n" " +[no]dnssec (Request DNSSEC records)\n" " +[no]expire (Request time to expire)\n" " +[no]cookie[=###] (Send a COOKIE option)\n" " +[no]nsid (Request Name " "Server ID)\n"); } noreturn static void fatal(const char *format, ...) ISC_FORMAT_PRINTF(1, 2); static void fatal(const char *format, ...) { va_list args; fflush(stdout); fprintf(stderr, "mdig: "); va_start(args, format); vfprintf(stderr, format, args); va_end(args); fprintf(stderr, "\n"); exit(-2); } static isc_result_t parse_uint_helper(uint32_t *uip, const char *value, uint32_t max, const char *desc, int base) { uint32_t n; isc_result_t result = isc_parse_uint32(&n, value, base); if (result == ISC_R_SUCCESS && n > max) { result = ISC_R_RANGE; } if (result != ISC_R_SUCCESS) { printf("invalid %s '%s': %s\n", desc, value, isc_result_totext(result)); return (result); } *uip = n; return (ISC_R_SUCCESS); } static isc_result_t parse_uint(uint32_t *uip, const char *value, uint32_t max, const char *desc) { return (parse_uint_helper(uip, value, max, desc, 10)); } static isc_result_t parse_xint(uint32_t *uip, const char *value, uint32_t max, const char *desc) { return (parse_uint_helper(uip, value, max, desc, 0)); } static void newopts(struct query *query) { size_t len = sizeof(query->ednsopts[0]) * EDNSOPTS; size_t i; query->ednsopts = isc_mem_allocate(mctx, len); for (i = 0; i < EDNSOPTS; i++) { query->ednsopts[i].code = 0; query->ednsopts[i].length = 0; query->ednsopts[i].value = NULL; } } static void save_opt(struct query *query, char *code, char *value) { uint32_t num; isc_buffer_t b; isc_result_t result; if (query->ednsopts == NULL) { newopts(query); } if (query->ednsoptscnt == EDNSOPTS) { fatal("too many ednsopts"); } result = parse_uint(&num, code, 65535, "ednsopt"); if (result != ISC_R_SUCCESS) { fatal("bad edns code point: %s", code); } query->ednsopts[query->ednsoptscnt].code = num; query->ednsopts[query->ednsoptscnt].length = 0; query->ednsopts[query->ednsoptscnt].value = NULL; if (value != NULL) { char *buf; buf = isc_mem_allocate(mctx, strlen(value) / 2 + 1); isc_buffer_init(&b, buf, strlen(value) / 2 + 1); result = isc_hex_decodestring(value, &b); CHECK("isc_hex_decodestring", result); query->ednsopts[query->ednsoptscnt].value = isc_buffer_base(&b); query->ednsopts[query->ednsoptscnt].length = isc_buffer_usedlength(&b); } query->ednsoptscnt++; } static isc_result_t parse_netprefix(isc_sockaddr_t **sap, const char *value) { isc_sockaddr_t *sa = NULL; struct in_addr in4; struct in6_addr in6; uint32_t netmask = 0xffffffff; char *slash = NULL; bool parsed = false; char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:XXX.XXX.XXX.XXX/128")]; if (strlcpy(buf, value, sizeof(buf)) >= sizeof(buf)) { fatal("invalid prefix '%s'\n", value); } slash = strchr(buf, '/'); if (slash != NULL) { isc_result_t result; *slash = '\0'; result = isc_parse_uint32(&netmask, slash + 1, 10); if (result != ISC_R_SUCCESS) { fatal("invalid prefix length in '%s': %s\n", value, isc_result_totext(result)); } } else if (strcmp(value, "0") == 0) { netmask = 0; } sa = isc_mem_allocate(mctx, sizeof(*sa)); if (inet_pton(AF_INET6, buf, &in6) == 1) { parsed = true; isc_sockaddr_fromin6(sa, &in6, 0); if (netmask > 128) { netmask = 128; } } else if (inet_pton(AF_INET, buf, &in4) == 1) { parsed = true; isc_sockaddr_fromin(sa, &in4, 0); if (netmask > 32) { netmask = 32; } } else if (netmask != 0xffffffff) { int i; for (i = 0; i < 3 && strlen(buf) < sizeof(buf) - 2; i++) { strlcat(buf, ".0", sizeof(buf)); if (inet_pton(AF_INET, buf, &in4) == 1) { parsed = true; isc_sockaddr_fromin(sa, &in4, 0); break; } } if (netmask > 32) { netmask = 32; } } if (!parsed) { fatal("invalid address '%s'", value); } sa->length = netmask; *sap = sa; return (ISC_R_SUCCESS); } /*% * Append 'len' bytes of 'text' at '*p', failing with * ISC_R_NOSPACE if that would advance p past 'end'. */ static isc_result_t append(const char *text, int len, char **p, char *end) { if (len > end - *p) { return (ISC_R_NOSPACE); } memmove(*p, text, len); *p += len; return (ISC_R_SUCCESS); } static isc_result_t reverse_octets(const char *in, char **p, char *end) { const char *dot = strchr(in, '.'); int len; if (dot != NULL) { isc_result_t result; result = reverse_octets(dot + 1, p, end); CHECK("reverse_octets", result); result = append(".", 1, p, end); CHECK("append", result); len = (int)(dot - in); } else { len = strlen(in); } return (append(in, len, p, end)); } static void get_reverse(char *reverse, size_t len, const char *value) { int r; isc_result_t result; isc_netaddr_t addr; addr.family = AF_INET6; r = inet_pton(AF_INET6, value, &addr.type.in6); if (r > 0) { /* This is a valid IPv6 address. */ dns_fixedname_t fname; dns_name_t *name; unsigned int options = 0; name = dns_fixedname_initname(&fname); result = dns_byaddr_createptrname(&addr, options, name); CHECK("dns_byaddr_createptrname2", result); dns_name_format(name, reverse, (unsigned int)len); return; } else { /* * Not a valid IPv6 address. Assume IPv4. * Construct the in-addr.arpa name by blindly * reversing octets whether or not they look like * integers, so that this can be used for RFC2317 * names and such. */ char *p = reverse; char *end = reverse + len; result = reverse_octets(value, &p, end); CHECK("reverse_octets", result); /* Append .in-addr.arpa. and a terminating NUL. */ result = append(".in-addr.arpa.", 15, &p, end); CHECK("append", result); return; } } /*% * We're not using isc_commandline_parse() here since the command line * syntax of mdig is quite a bit different from that which can be described * by that routine. * XXX doc options */ static void plus_option(char *option, struct query *query, bool global) { isc_result_t result; char *cmd, *value, *last = NULL, *code; uint32_t num; bool state = true; size_t n; INSIST(option != NULL); if ((cmd = strtok_r(option, "=", &last)) == NULL) { printf(";; Invalid option %s\n", option); return; } if (strncasecmp(cmd, "no", 2) == 0) { cmd += 2; state = false; } /* parse the rest of the string */ value = strtok_r(NULL, "", &last); #define FULLCHECK(A) \ do { \ size_t _l = strlen(cmd); \ if (_l >= sizeof(A) || strncasecmp(cmd, A, _l) != 0) \ goto invalid_option; \ } while (0) #define FULLCHECK2(A, B) \ do { \ size_t _l = strlen(cmd); \ if ((_l >= sizeof(A) || strncasecmp(cmd, A, _l) != 0) && \ (_l >= sizeof(B) || strncasecmp(cmd, B, _l) != 0)) \ goto invalid_option; \ } while (0) #define GLOBAL() \ do { \ if (!global) \ goto global_option; \ } while (0) switch (cmd[0]) { case 'a': switch (cmd[1]) { case 'a': /* aaonly / aaflag */ FULLCHECK2("aaonly", "aaflag"); query->have_aaonly = state; break; case 'd': switch (cmd[2]) { case 'd': /* additional */ FULLCHECK("additional"); display_additional = state; break; case 'f': /* adflag */ case '\0': /* +ad is a synonym for +adflag */ FULLCHECK("adflag"); query->have_adflag = state; break; default: goto invalid_option; } break; case 'l': /* all */ FULLCHECK("all"); GLOBAL(); display_question = state; display_answer = state; display_authority = state; display_additional = state; display_comments = state; display_rrcomments = state ? 1 : -1; break; case 'n': /* answer */ FULLCHECK("answer"); GLOBAL(); display_answer = state; break; case 'u': /* authority */ FULLCHECK("authority"); GLOBAL(); display_authority = state; break; default: goto invalid_option; } break; case 'b': switch (cmd[1]) { case 'e': /* besteffort */ FULLCHECK("besteffort"); GLOBAL(); besteffort = state; break; case 'u': switch (cmd[2]) { case 'f': /* bufsize */ FULLCHECK("bufsize"); if (value == NULL) { goto need_value; } if (!state) { goto invalid_option; } result = parse_uint(&num, value, COMMSIZE, "buffer size"); CHECK("parse_uint(buffer size)", result); query->udpsize = num; break; case 'r': /* burst */ FULLCHECK("burst"); GLOBAL(); burst = state; break; default: goto invalid_option; } break; default: goto invalid_option; } break; case 'c': switch (cmd[1]) { case 'd': /* cdflag */ switch (cmd[2]) { case 'f': /* cdflag */ case '\0': /* +cd is a synonym for +cdflag */ FULLCHECK("cdflag"); query->have_cdflag = state; break; default: goto invalid_option; } break; case 'l': /* cl */ FULLCHECK("cl"); GLOBAL(); display_class = state; break; case 'o': /* comments */ switch (cmd[2]) { case 'm': FULLCHECK("comments"); GLOBAL(); display_comments = state; break; case 'n': FULLCHECK("continue"); GLOBAL(); continue_on_error = state; break; case 'o': FULLCHECK("cookie"); if (state && query->edns == -1) { query->edns = 0; } query->send_cookie = state; if (value != NULL) { n = strlcpy(hexcookie, value, sizeof(hexcookie)); if (n >= sizeof(hexcookie)) { fatal("COOKIE data too large"); } query->cookie = hexcookie; } else { query->cookie = NULL; } break; default: goto invalid_option; } break; case 'r': FULLCHECK("crypto"); GLOBAL(); display_crypto = state; break; default: goto invalid_option; } break; case 'd': switch (cmd[1]) { case 'n': /* dnssec */ FULLCHECK("dnssec"); if (state && query->edns == -1) { query->edns = 0; } query->dnssec = state; break; case 's': /* dscp */ /* obsolete */ FULLCHECK("dscp"); fprintf(stderr, ";; +dscp option is obsolete " "and has no effect"); break; default: goto invalid_option; } break; case 'e': switch (cmd[1]) { case 'd': switch (cmd[2]) { case 'n': switch (cmd[3]) { case 's': switch (cmd[4]) { case 0: FULLCHECK("edns"); if (!state) { query->edns = -1; break; } if (value == NULL) { query->edns = 0; break; } result = parse_uint(&num, value, 255, "edns"); CHECK("parse_uint(edns)", result); query->edns = num; break; case 'f': FULLCHECK("ednsflags"); if (!state) { query->ednsflags = 0; break; } if (value == NULL) { query->ednsflags = 0; break; } result = parse_xint( &num, value, 0xffff, "ednsflags"); CHECK("parse_xint(ednsflags)", result); query->ednsflags = num; break; case 'o': FULLCHECK("ednsopt"); if (!state) { query->ednsoptscnt = 0; break; } code = NULL; if (value != NULL) { code = strtok_r(value, ":", &last); } if (code == NULL) { fatal("ednsopt no " "code point " "specified"); } value = strtok_r(NULL, "\0", &last); save_opt(query, code, value); break; default: goto invalid_option; } break; default: goto invalid_option; } break; default: goto invalid_option; } break; case 'x': FULLCHECK("expire"); query->expire = state; break; default: goto invalid_option; } break; case 'm': /* multiline */ FULLCHECK("multiline"); GLOBAL(); display_multiline = state; break; case 'n': FULLCHECK("nsid"); if (state && query->edns == -1) { query->edns = 0; } query->nsid = state; break; case 'q': FULLCHECK("question"); GLOBAL(); display_question = state; break; case 'r': switch (cmd[1]) { case 'e': switch (cmd[2]) { case 'c': /* recurse */ FULLCHECK("recurse"); query->recurse = state; break; case 't': /* retry / retries */ FULLCHECK2("retry", "retries"); if (value == NULL) { goto need_value; } if (!state) { goto invalid_option; } result = parse_uint(&query->udpretries, value, MAXTRIES - 1, "udpretries"); CHECK("parse_uint(udpretries)", result); break; default: goto invalid_option; } break; case 'r': FULLCHECK("rrcomments"); GLOBAL(); display_rrcomments = state ? 1 : -1; break; default: goto invalid_option; } break; case 's': switch (cmd[1]) { case 'h': FULLCHECK("short"); GLOBAL(); display_short_form = state; if (state) { display_question = false; display_answer = true; display_authority = false; display_additional = false; display_comments = false; display_rrcomments = -1; } break; case 'p': /* split */ FULLCHECK("split"); GLOBAL(); if (value != NULL && !state) { goto invalid_option; } if (!state) { display_splitwidth = 0; break; } else if (value == NULL) { break; } result = parse_uint(&display_splitwidth, value, 1023, "split"); if ((display_splitwidth % 4) != 0) { display_splitwidth = ((display_splitwidth + 3) / 4) * 4; fprintf(stderr, ";; Warning, split must be " "a multiple of 4; adjusting " "to %u\n", display_splitwidth); } /* * There is an adjustment done in the * totext_() functions which causes * splitwidth to shrink. This is okay when we're * using the default width but incorrect in this * case, so we correct for it */ if (display_splitwidth) { display_splitwidth += 3; } CHECK("parse_uint(split)", result); break; case 'u': /* subnet */ FULLCHECK("subnet"); if (state && value == NULL) { goto need_value; } if (!state) { if (query->ecs_addr != NULL) { isc_mem_free(mctx, query->ecs_addr); query->ecs_addr = NULL; } break; } if (query->edns == -1) { query->edns = 0; } result = parse_netprefix(&query->ecs_addr, value); CHECK("parse_netprefix", result); break; default: goto invalid_option; } break; case 't': switch (cmd[1]) { case 'c': /* tcp */ FULLCHECK("tcp"); GLOBAL(); tcp_mode = state; break; case 'i': /* timeout */ FULLCHECK("timeout"); if (value == NULL) { goto need_value; } if (!state) { goto invalid_option; } result = parse_uint(&query->timeout, value, MAXTIMEOUT, "timeout"); CHECK("parse_uint(timeout)", result); if (query->timeout == 0) { query->timeout = 1; } break; case 'r': FULLCHECK("tries"); if (value == NULL) { goto need_value; } if (!state) { goto invalid_option; } result = parse_uint(&query->udpretries, value, MAXTRIES, "udpretries"); CHECK("parse_uint(udpretries)", result); if (query->udpretries > 0) { query->udpretries -= 1; } break; case 't': switch (cmd[2]) { case 'l': switch (cmd[3]) { case 0: case 'i': /* ttlid */ FULLCHECK2("ttl", "ttlid"); GLOBAL(); display_ttl = state; break; case 'u': /* ttlunits */ FULLCHECK("ttlunits"); GLOBAL(); display_ttl = true; display_ttlunits = state; break; default: goto invalid_option; } break; default: goto invalid_option; } break; default: goto invalid_option; } break; case 'u': switch (cmd[1]) { case 'd': FULLCHECK("udptimeout"); if (value == NULL) { goto need_value; } if (!state) { goto invalid_option; } result = parse_uint(&query->udptimeout, value, MAXTIMEOUT, "udptimeout"); CHECK("parse_uint(udptimeout)", result); break; case 'n': FULLCHECK("unknownformat"); display_unknown_format = state; break; default: goto invalid_option; } break; case 'v': FULLCHECK("vc"); GLOBAL(); tcp_mode = state; break; case 'y': /* yaml */ FULLCHECK("yaml"); yaml = state; if (state) { display_rrcomments = state; } break; case 'z': /* zflag */ FULLCHECK("zflag"); query->have_zflag = state; break; global_option: fprintf(stderr, "Ignored late global option: +%s\n", option); break; default: invalid_option: need_value: fprintf(stderr, "Invalid option: +%s\n", option); usage(); } return; } /*% * #true returned if value was used */ static const char *single_dash_opts = "46himv"; static const char *dash_opts = "46bcfhiptvx"; static bool dash_option(const char *option, char *next, struct query *query, bool global, bool *setname) { char opt; const char *value; isc_result_t result; bool value_from_next; isc_consttextregion_t tr; dns_rdatatype_t rdtype; dns_rdataclass_t rdclass; char textname[MXNAME]; struct in_addr in4; struct in6_addr in6; in_port_t srcport; char *hash; uint32_t num; while (strpbrk(option, single_dash_opts) == &option[0]) { /* * Since the -[46hiv] options do not take an argument, * account for them (in any number and/or combination) * if they appear as the first character(s) of an opt. */ opt = option[0]; switch (opt) { case '4': GLOBAL(); if (have_ipv4) { isc_net_disableipv6(); have_ipv6 = false; } else { fatal("can't find IPv4 networking"); UNREACHABLE(); return (false); } break; case '6': GLOBAL(); if (have_ipv6) { isc_net_disableipv4(); have_ipv4 = false; } else { fatal("can't find IPv6 networking"); UNREACHABLE(); return (false); } break; case 'h': help(); exit(0); break; case 'i': /* deprecated */ break; case 'm': /* * handled by preparse_args() */ break; case 'v': fprintf(stderr, "mDiG %s\n", PACKAGE_VERSION); exit(0); break; } if (strlen(option) > 1U) { option = &option[1]; } else { return (false); } } opt = option[0]; if (strlen(option) > 1U) { value_from_next = false; value = &option[1]; } else { value_from_next = true; value = next; } if (value == NULL) { goto invalid_option; } switch (opt) { case 'b': GLOBAL(); hash = strchr(value, '#'); if (hash != NULL) { result = parse_uint(&num, hash + 1, MAXPORT, "port number"); CHECK("parse_uint(srcport)", result); srcport = num; *hash = '\0'; } else { srcport = 0; } if (have_ipv6 && inet_pton(AF_INET6, value, &in6) == 1) { isc_sockaddr_fromin6(&srcaddr, &in6, srcport); isc_net_disableipv4(); } else if (have_ipv4 && inet_pton(AF_INET, value, &in4) == 1) { isc_sockaddr_fromin(&srcaddr, &in4, srcport); isc_net_disableipv6(); } else { if (hash != NULL) { *hash = '#'; } fatal("invalid address %s", value); } if (hash != NULL) { *hash = '#'; } have_src = true; return (value_from_next); case 'c': tr.base = value; tr.length = strlen(value); result = dns_rdataclass_fromtext(&rdclass, (isc_textregion_t *)&tr); CHECK("dns_rdataclass_fromtext", result); query->rdclass = rdclass; return (value_from_next); case 'f': batchname = value; return (value_from_next); case 'p': GLOBAL(); result = parse_uint(&num, value, MAXPORT, "port number"); CHECK("parse_uint(port)", result); port = num; return (value_from_next); case 't': tr.base = value; tr.length = strlen(value); result = dns_rdatatype_fromtext(&rdtype, (isc_textregion_t *)&tr); CHECK("dns_rdatatype_fromtext", result); query->rdtype = rdtype; return (value_from_next); case 'x': get_reverse(textname, sizeof(textname), value); strlcpy(query->textname, textname, sizeof(query->textname)); query->rdtype = dns_rdatatype_ptr; query->rdclass = dns_rdataclass_in; *setname = true; return (value_from_next); global_option: fprintf(stderr, "Ignored late global option: -%s\n", option); usage(); default: invalid_option: fprintf(stderr, "Invalid option: -%s\n", option); usage(); } UNREACHABLE(); return (false); } static struct query * clone_default_query(void) { struct query *query; query = isc_mem_allocate(mctx, sizeof(struct query)); memmove(query, &default_query, sizeof(struct query)); if (default_query.ecs_addr != NULL) { size_t len = sizeof(isc_sockaddr_t); query->ecs_addr = isc_mem_allocate(mctx, len); memmove(query->ecs_addr, default_query.ecs_addr, len); } if (query->timeout == 0) { query->timeout = tcp_mode ? TCPTIMEOUT : UDPTIMEOUT; } return (query); } /*% * Because we may be trying to do memory allocation recording, we're going * to need to parse the arguments for the -m *before* we start the main * argument parsing routine. * * I'd prefer not to have to do this, but I am not quite sure how else to * fix the problem. Argument parsing in mdig involves memory allocation * by its nature, so it can't be done in the main argument parser. */ static void preparse_args(int argc, char **argv) { int rc; char **rv; char *option; bool ipv4only = false, ipv6only = false; rc = argc; rv = argv; for (rc--, rv++; rc > 0; rc--, rv++) { if (rv[0][0] != '-') { continue; } option = &rv[0][1]; while (strpbrk(option, single_dash_opts) == &option[0]) { switch (option[0]) { case 'm': isc_mem_debugging = ISC_MEM_DEBUGTRACE | ISC_MEM_DEBUGRECORD; break; case '4': if (ipv6only) { fatal("only one of -4 and -6 allowed"); } ipv4only = true; break; case '6': if (ipv4only) { fatal("only one of -4 and -6 allowed"); } ipv6only = true; break; } option = &option[1]; } if (strlen(option) == 0U) { continue; } /* Look for dash value option. */ if (strpbrk(option, dash_opts) != &option[0] || strlen(option) > 1U) { /* Error or value in option. */ continue; } /* Dash value is next argument so we need to skip it. */ rc--, rv++; /* Handle missing argument */ if (rc == 0) { break; } } } static void parse_args(bool is_batchfile, int argc, char **argv) { struct query *query = NULL; char batchline[MXNAME]; int bargc; char *bargv[64]; int rc; char **rv; bool global = true; char *last; /* * The semantics for parsing the args is a bit complex; if * we don't have a host yet, make the arg apply globally, * otherwise make it apply to the latest host. This is * a bit different than the previous versions, but should * form a consistent user interface. * * First, create a "default query" which won't actually be used * anywhere, except for cloning into new queries */ if (!is_batchfile) { default_query.textname[0] = 0; default_query.recurse = true; default_query.have_aaonly = false; default_query.have_adflag = true; /*XXX*/ default_query.have_cdflag = false; default_query.have_zflag = false; default_query.dnssec = false; default_query.expire = false; default_query.send_cookie = false; default_query.cookie = NULL; default_query.nsid = false; default_query.rdtype = dns_rdatatype_a; default_query.rdclass = dns_rdataclass_in; default_query.udpsize = 0; default_query.edns = 0; /*XXX*/ default_query.ednsopts = NULL; default_query.ednsoptscnt = 0; default_query.ednsflags = 0; default_query.ecs_addr = NULL; default_query.timeout = 0; default_query.udptimeout = 0; default_query.udpretries = 2; ISC_LINK_INIT(&default_query, link); } if (is_batchfile) { /* Processing '-f batchfile'. */ query = clone_default_query(); global = false; } else { query = &default_query; } rc = argc; rv = argv; for (rc--, rv++; rc > 0; rc--, rv++) { if (strncmp(rv[0], "%", 1) == 0) { break; } if (rv[0][0] == '@') { if (server != NULL) { fatal("server already set to @%s", server); } server = &rv[0][1]; } else if (rv[0][0] == '+') { plus_option(&rv[0][1], query, global); } else if (rv[0][0] == '-') { bool setname = false; if (rc <= 1) { if (dash_option(&rv[0][1], NULL, query, global, &setname)) { rc--; rv++; } } else { if (dash_option(&rv[0][1], rv[1], query, global, &setname)) { rc--; rv++; } } if (setname) { if (query == &default_query) { query = clone_default_query(); } ISC_LIST_APPEND(queries, query, link); default_query.textname[0] = 0; query = clone_default_query(); global = false; } } else { /* * Anything which isn't an option */ if (query == &default_query) { query = clone_default_query(); } strlcpy(query->textname, rv[0], sizeof(query->textname)); ISC_LIST_APPEND(queries, query, link); query = clone_default_query(); global = false; /* XXX Error message */ } } /* * If we have a batchfile, read the query list from it. */ if ((batchname != NULL) && !is_batchfile) { if (strcmp(batchname, "-") == 0) { batchfp = stdin; } else { batchfp = fopen(batchname, "r"); } if (batchfp == NULL) { perror(batchname); fatal("couldn't open batch file '%s'", batchname); } while (fgets(batchline, sizeof(batchline), batchfp) != 0) { if (batchline[0] == '\r' || batchline[0] == '\n' || batchline[0] == '#' || batchline[0] == ';') { continue; } for (bargc = 1, bargv[bargc] = strtok_r( batchline, " \t\r\n", &last); (bargc < 14) && bargv[bargc]; bargc++, bargv[bargc] = strtok_r(NULL, " \t\r\n", &last)) { /* empty body */ } bargv[0] = argv[0]; parse_args(true, bargc, (char **)bargv); } if (batchfp != stdin) { fclose(batchfp); } } if (query != &default_query) { if (query->ecs_addr != NULL) { isc_mem_free(mctx, query->ecs_addr); } isc_mem_free(mctx, query); } } /* * Try honoring the operating system's preferred ephemeral port range. */ static void set_source_ports(dns_dispatchmgr_t *manager) { isc_portset_t *v4portset = NULL, *v6portset = NULL; in_port_t udpport_low, udpport_high; isc_result_t result; result = isc_portset_create(mctx, &v4portset); if (result != ISC_R_SUCCESS) { fatal("isc_portset_create (v4) failed"); } result = isc_net_getudpportrange(AF_INET, &udpport_low, &udpport_high); if (result != ISC_R_SUCCESS) { fatal("isc_net_getudpportrange (v4) failed"); } isc_portset_addrange(v4portset, udpport_low, udpport_high); result = isc_portset_create(mctx, &v6portset); if (result != ISC_R_SUCCESS) { fatal("isc_portset_create (v6) failed"); } result = isc_net_getudpportrange(AF_INET6, &udpport_low, &udpport_high); if (result != ISC_R_SUCCESS) { fatal("isc_net_getudpportrange (v6) failed"); } isc_portset_addrange(v6portset, udpport_low, udpport_high); result = dns_dispatchmgr_setavailports(manager, v4portset, v6portset); if (result != ISC_R_SUCCESS) { fatal("dns_dispatchmgr_setavailports failed"); } isc_portset_destroy(mctx, &v4portset); isc_portset_destroy(mctx, &v6portset); } /*% Main processing routine for mdig */ int main(int argc, char *argv[]) { struct query *query = NULL; isc_result_t result; isc_sockaddr_t bind_any; isc_log_t *lctx = NULL; isc_logconfig_t *lcfg = NULL; isc_nm_t *netmgr = NULL; isc_taskmgr_t *taskmgr = NULL; isc_task_t *task = NULL; dns_dispatchmgr_t *dispatchmgr = NULL; dns_dispatch_t *dispatchvx = NULL; dns_view_t *view = NULL; unsigned int i; int ns; RUNCHECK(isc_app_start()); if (isc_net_probeipv4() == ISC_R_SUCCESS) { have_ipv4 = true; } if (isc_net_probeipv6() == ISC_R_SUCCESS) { have_ipv6 = true; } if (!have_ipv4 && !have_ipv6) { fatal("could not find either IPv4 or IPv6"); } preparse_args(argc, argv); isc_mem_create(&mctx); isc_log_create(mctx, &lctx, &lcfg); RUNCHECK(dst_lib_init(mctx, NULL)); isc_nonce_buf(cookie_secret, sizeof(cookie_secret)); ISC_LIST_INIT(queries); parse_args(false, argc, argv); if (server == NULL) { fatal("a server '@xxx' is required"); } ns = 0; result = bind9_getaddresses(server, port, &dstaddr, 1, &ns); if (result != ISC_R_SUCCESS) { fatal("couldn't get address for '%s': %s", server, isc_result_totext(result)); } if (isc_sockaddr_pf(&dstaddr) == PF_INET && have_ipv6) { isc_net_disableipv6(); have_ipv6 = false; } else if (isc_sockaddr_pf(&dstaddr) == PF_INET6 && have_ipv4) { isc_net_disableipv4(); have_ipv4 = false; } if (have_ipv4 && have_ipv6) { fatal("can't choose between IPv4 and IPv6"); } isc_managers_create(mctx, 1, 0, &netmgr, &taskmgr, NULL); RUNCHECK(isc_task_create(taskmgr, 0, &task)); RUNCHECK(dns_dispatchmgr_create(mctx, netmgr, &dispatchmgr)); set_source_ports(dispatchmgr); if (have_ipv4) { isc_sockaddr_any(&bind_any); } else { isc_sockaddr_any6(&bind_any); } RUNCHECK(dns_dispatch_createudp( dispatchmgr, have_src ? &srcaddr : &bind_any, &dispatchvx)); RUNCHECK(dns_requestmgr_create( mctx, taskmgr, dispatchmgr, have_ipv4 ? dispatchvx : NULL, have_ipv6 ? dispatchvx : NULL, &requestmgr)); RUNCHECK(dns_view_create(mctx, 0, "_test", &view)); query = ISC_LIST_HEAD(queries); RUNCHECK(isc_app_onrun(mctx, task, sendqueries, query)); /* * Stall to the start of a new second. */ if (burst) { isc_time_t start, now; RUNCHECK(isc_time_now(&start)); /* * Sleep to 1ms of the end of the second then run a busy loop * until the second changes. */ do { RUNCHECK(isc_time_now(&now)); if (isc_time_seconds(&start) == isc_time_seconds(&now)) { int us = US_PER_SEC - (isc_time_nanoseconds(&now) / NS_PER_US); if (us > US_PER_MS) { usleep(us - US_PER_MS); } } else { break; } } while (1); } (void)isc_app_run(); dns_view_detach(&view); dns_requestmgr_shutdown(requestmgr); dns_requestmgr_detach(&requestmgr); dns_dispatch_detach(&dispatchvx); dns_dispatchmgr_detach(&dispatchmgr); isc_task_shutdown(task); isc_task_detach(&task); isc_managers_destroy(&netmgr, &taskmgr, NULL); dst_lib_destroy(); isc_log_destroy(&lctx); query = ISC_LIST_HEAD(queries); while (query != NULL) { struct query *next = ISC_LIST_NEXT(query, link); if (query->ednsopts != NULL) { for (i = 0; i < EDNSOPTS; i++) { if (query->ednsopts[i].value != NULL) { isc_mem_free(mctx, query->ednsopts[i].value); } } isc_mem_free(mctx, query->ednsopts); } if (query->ecs_addr != NULL) { isc_mem_free(mctx, query->ecs_addr); query->ecs_addr = NULL; } isc_mem_free(mctx, query); query = next; } if (default_query.ecs_addr != NULL) { isc_mem_free(mctx, default_query.ecs_addr); } isc_mem_destroy(&mctx); isc_app_finish(); return (0); }