/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at https://curl.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * SPDX-License-Identifier: curl * ***************************************************************************/ #include "curlcheck.h" #include "doh.h" #include "dynbuf.h" static CURLcode unit_setup(void) { return CURLE_OK; } static void unit_stop(void) { } #ifndef CURL_DISABLE_DOH #define DNS_PREAMBLE "\x00\x00\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00" #define LABEL_TEST "\x04\x74\x65\x73\x74" #define LABEL_HOST "\x04\x68\x6f\x73\x74" #define LABEL_NAME "\x04\x6e\x61\x6d\x65" #define DNSA_TYPE "\x01" #define DNSAAAA_TYPE "\x1c" #define DNSA_EPILOGUE "\x00\x00" DNSA_TYPE "\x00\x01" #define DNSAAAA_EPILOGUE "\x00\x00" DNSAAAA_TYPE "\x00\x01" #define DNS_Q1 DNS_PREAMBLE LABEL_TEST LABEL_HOST LABEL_NAME DNSA_EPILOGUE #define DNS_Q2 DNS_PREAMBLE LABEL_TEST LABEL_HOST LABEL_NAME DNSAAAA_EPILOGUE struct dohrequest { /* input */ const char *name; DNStype type; /* output */ const char *packet; size_t size; int rc; }; static const struct dohrequest req[] = { {"test.host.name", DNS_TYPE_A, DNS_Q1, sizeof(DNS_Q1)-1, 0 }, {"test.host.name", DNS_TYPE_AAAA, DNS_Q2, sizeof(DNS_Q2)-1, 0 }, {"zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz" ".host.name", DNS_TYPE_AAAA, NULL, 0, DOH_DNS_BAD_LABEL } }; struct dohresp { /* input */ const char *packet; size_t size; DNStype type; /* output */ int rc; const char *out; }; #define DNS_FOO_EXAMPLE_COM \ "\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x03\x66\x6f\x6f" \ "\x07\x65\x78\x61\x6d\x70\x6c\x65\x03\x63\x6f\x6d\x00\x00\x01\x00" \ "\x01\xc0\x0c\x00\x01\x00\x01\x00\x00\x00\x37\x00\x04\x7f\x00\x00" \ "\x01" static const char full49[] = DNS_FOO_EXAMPLE_COM; static const struct dohresp resp[] = { {"\x00\x00", 2, DNS_TYPE_A, DOH_TOO_SMALL_BUFFER, NULL }, {"\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01", 12, DNS_TYPE_A, DOH_DNS_BAD_ID, NULL }, {"\x00\x00\x00\x01\x00\x01\x00\x01\x00\x01\x00\x01", 12, DNS_TYPE_A, DOH_DNS_BAD_RCODE, NULL }, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x03\x66\x6f\x6f", 16, DNS_TYPE_A, DOH_DNS_OUT_OF_RANGE, NULL }, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x03\x66\x6f\x6f\x00", 17, DNS_TYPE_A, DOH_DNS_OUT_OF_RANGE, NULL }, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x03\x66\x6f\x6f\x00" "\x00\x01\x00\x01", 21, DNS_TYPE_A, DOH_DNS_OUT_OF_RANGE, NULL }, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x03\x66\x6f\x6f\x00" "\x00\x01\x00\x01" "\x04", 18, DNS_TYPE_A, DOH_DNS_OUT_OF_RANGE, NULL }, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x04\x63\x75\x72" "\x6c\x04\x63\x75\x72\x6c\x00\x00\x05\x00\x01\xc0\x0c\x00\x05\x00" "\x01\x00\x00\x00\x37\x00\x11\x08\x61\x6e\x79\x77\x68\x65\x72\x65" "\x06\x72\x65\x61\x6c\x6c\x79\x00", 56, DNS_TYPE_A, DOH_OK, "anywhere.really "}, {DNS_FOO_EXAMPLE_COM, 49, DNS_TYPE_A, DOH_OK, "127.0.0.1 "}, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x04\x61\x61\x61" "\x61\x07\x65\x78\x61\x6d\x70\x6c\x65\x03\x63\x6f\x6d\x00\x00\x1c" "\x00\x01\xc0\x0c\x00\x1c\x00\x01\x00\x00\x00\x37\x00\x10\x20\x20" "\x20\x20\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\x20", 62, DNS_TYPE_AAAA, DOH_OK, "2020:2020:0000:0000:0000:0000:0000:2020 " }, {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x00\x04\x63\x75\x72" "\x6c\x04\x63\x75\x72\x6c\x00\x00\x05\x00\x01\xc0\x0c\x00\x05\x00" "\x01\x00\x00\x00\x37\x00" "\x07\x03\x61\x6e\x79\xc0\x27\x00", 46, DNS_TYPE_A, DOH_DNS_LABEL_LOOP, NULL}, /* packet with NSCOUNT == 1 */ {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x01\x00\x00\x04\x61\x61\x61" "\x61\x07\x65\x78\x61\x6d\x70\x6c\x65\x03\x63\x6f\x6d\x00\x00\x1c" "\x00\x01\xc0\x0c\x00\x1c\x00\x01\x00\x00\x00\x37\x00\x10\x20\x20" "\x20\x20\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\x20" LABEL_TEST LABEL_HOST LABEL_NAME DNSAAAA_EPILOGUE "\x00\x00\x00\x01" "\00\x04\x01\x01\x01\x01", /* RDDATA */ 62 + 30, DNS_TYPE_AAAA, DOH_OK, "2020:2020:0000:0000:0000:0000:0000:2020 " }, /* packet with ARCOUNT == 1 */ {"\x00\x00\x01\x00\x00\x01\x00\x01\x00\x00\x00\x01\x04\x61\x61\x61" "\x61\x07\x65\x78\x61\x6d\x70\x6c\x65\x03\x63\x6f\x6d\x00\x00\x1c" "\x00\x01\xc0\x0c\x00\x1c\x00\x01\x00\x00\x00\x37\x00\x10\x20\x20" "\x20\x20\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\x20" LABEL_TEST LABEL_HOST LABEL_NAME DNSAAAA_EPILOGUE "\x00\x00\x00\x01" "\00\x04\x01\x01\x01\x01", /* RDDATA */ 62 + 30, DNS_TYPE_AAAA, DOH_OK, "2020:2020:0000:0000:0000:0000:0000:2020 " }, }; UNITTEST_START { size_t size = 0; unsigned char buffer[256]; size_t i; unsigned char *p; for(i = 0; i < sizeof(req) / sizeof(req[0]); i++) { int rc = doh_encode(req[i].name, req[i].type, buffer, sizeof(buffer), &size); if(rc != req[i].rc) { fprintf(stderr, "req %zu: Expected return code %d got %d\n", i, req[i].rc, rc); abort_if(rc != req[i].rc, "return code"); } if(size != req[i].size) { fprintf(stderr, "req %zu: Expected size %zu got %zu\n", i, req[i].size, size); fprintf(stderr, "DNS encode made: %s\n", hexdump(buffer, size)); abort_if(size != req[i].size, "size"); } if(req[i].packet && memcmp(req[i].packet, buffer, size)) { fprintf(stderr, "DNS encode made: %s\n", hexdump(buffer, size)); fprintf(stderr, "... instead of: %s\n", hexdump((unsigned char *)req[i].packet, size)); abort_if(req[i].packet && memcmp(req[i].packet, buffer, size), "contents"); } } for(i = 0; i < sizeof(resp) / sizeof(resp[0]); i++) { struct dohentry d; int rc; char *ptr; size_t len; int u; de_init(&d); rc = doh_decode((const unsigned char *)resp[i].packet, resp[i].size, resp[i].type, &d); if(rc != resp[i].rc) { fprintf(stderr, "resp %zu: Expected return code %d got %d\n", i, resp[i].rc, rc); abort_if(rc != resp[i].rc, "return code"); } len = sizeof(buffer); ptr = (char *)buffer; for(u = 0; u < d.numaddr; u++) { size_t o; struct dohaddr *a; a = &d.addr[u]; if(resp[i].type == DNS_TYPE_A) { p = &a->ip.v4[0]; msnprintf(ptr, len, "%u.%u.%u.%u ", p[0], p[1], p[2], p[3]); o = strlen(ptr); len -= o; ptr += o; } else { int j; for(j = 0; j < 16; j += 2) { size_t l; msnprintf(ptr, len, "%s%02x%02x", j?":":"", a->ip.v6[j], a->ip.v6[j + 1]); l = strlen(ptr); len -= l; ptr += l; } msnprintf(ptr, len, " "); len--; ptr++; } } for(u = 0; u < d.numcname; u++) { size_t o; msnprintf(ptr, len, "%s ", Curl_dyn_ptr(&d.cname[u])); o = strlen(ptr); len -= o; ptr += o; } de_cleanup(&d); if(resp[i].out && strcmp((char *)buffer, resp[i].out)) { fprintf(stderr, "resp %zu: Expected %s got %s\n", i, resp[i].out, buffer); abort_if(resp[i].out && strcmp((char *)buffer, resp[i].out), "content"); } } /* pass all sizes into the decoder until full */ for(i = 0; i < sizeof(full49)-1; i++) { struct dohentry d; int rc; memset(&d, 0, sizeof(d)); rc = doh_decode((const unsigned char *)full49, i, DNS_TYPE_A, &d); if(!rc) { /* none of them should work */ fprintf(stderr, "%zu: %d\n", i, rc); abort_if(!rc, "error rc"); } } /* and try all pieces from the other end of the packet */ for(i = 1; i < sizeof(full49); i++) { struct dohentry d; int rc; memset(&d, 0, sizeof(d)); rc = doh_decode((const unsigned char *)&full49[i], sizeof(full49)-i-1, DNS_TYPE_A, &d); if(!rc) { /* none of them should work */ fprintf(stderr, "2 %zu: %d\n", i, rc); abort_if(!rc, "error rc"); } } { int rc; struct dohentry d; struct dohaddr *a; memset(&d, 0, sizeof(d)); rc = doh_decode((const unsigned char *)full49, sizeof(full49)-1, DNS_TYPE_A, &d); fail_if(d.numaddr != 1, "missing address"); a = &d.addr[0]; p = &a->ip.v4[0]; msnprintf((char *)buffer, sizeof(buffer), "%u.%u.%u.%u", p[0], p[1], p[2], p[3]); if(rc || strcmp((char *)buffer, "127.0.0.1")) { fprintf(stderr, "bad address decoded: %s, rc == %d\n", buffer, rc); abort_if(rc || strcmp((char *)buffer, "127.0.0.1"), "bad address"); } fail_if(d.numcname, "bad cname counter"); } } UNITTEST_STOP #else /* CURL_DISABLE_DOH */ UNITTEST_START /* nothing to do, just succeed */ UNITTEST_STOP #endif