diff options
Diffstat (limited to 'usr.sbin/bind/lib/lwres/lwresutil.c')
| -rw-r--r-- | usr.sbin/bind/lib/lwres/lwresutil.c | 575 |
1 files changed, 0 insertions, 575 deletions
diff --git a/usr.sbin/bind/lib/lwres/lwresutil.c b/usr.sbin/bind/lib/lwres/lwresutil.c deleted file mode 100644 index 29a3d6a073f..00000000000 --- a/usr.sbin/bind/lib/lwres/lwresutil.c +++ /dev/null @@ -1,575 +0,0 @@ -/* - * Copyright (C) Internet Systems Consortium, Inc. ("ISC") - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH - * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY - * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, - * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM - * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE - * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR - * PERFORMANCE OF THIS SOFTWARE. - */ - -/* $Id: lwresutil.c,v 1.6 2019/12/17 01:46:38 sthen Exp $ */ - -/*! \file */ - -/** - * lwres_string_parse() retrieves a DNS-encoded string starting the - * current pointer of lightweight resolver buffer b: i.e. b->current. - * When the function returns, the address of the first byte of the - * encoded string is returned via *c and the length of that string is - * given by *len. The buffer's current pointer is advanced to point at - * the character following the string length, the encoded string, and - * the trailing NULL character. - * - * lwres_addr_parse() extracts an address from the buffer b. The - * buffer's current pointer b->current is presumed to point at an - * encoded address: the address preceded by a 32-bit protocol family - * identifier and a 16-bit length field. The encoded address is copied - * to addr->address and addr->length indicates the size in bytes of - * the address that was copied. b->current is advanced to point at the - * next byte of available data in the buffer following the encoded - * address. - * - * lwres_getaddrsbyname() and lwres_getnamebyaddr() use the - * lwres_gnbaresponse_t structure defined below: - * - * \code - * typedef struct { - * lwres_uint32_t flags; - * lwres_uint16_t naliases; - * lwres_uint16_t naddrs; - * char *realname; - * char **aliases; - * lwres_uint16_t realnamelen; - * lwres_uint16_t *aliaslen; - * lwres_addrlist_t addrs; - * void *base; - * size_t baselen; - * } lwres_gabnresponse_t; - * \endcode - * - * The contents of this structure are not manipulated directly but - * they are controlled through the \link lwres_gabn.c lwres_gabn*\endlink functions. - * - * The lightweight resolver uses lwres_getaddrsbyname() to perform - * foward lookups. Hostname name is looked up using the resolver - * context ctx for memory allocation. addrtypes is a bitmask - * indicating which type of addresses are to be looked up. Current - * values for this bitmask are #LWRES_ADDRTYPE_V4 for IPv4 addresses - * and #LWRES_ADDRTYPE_V6 for IPv6 addresses. Results of the lookup are - * returned in *structp. - * - * lwres_getnamebyaddr() performs reverse lookups. Resolver context - * ctx is used for memory allocation. The address type is indicated by - * addrtype: #LWRES_ADDRTYPE_V4 or #LWRES_ADDRTYPE_V6. The address to be - * looked up is given by addr and its length is addrlen bytes. The - * result of the function call is made available through *structp. - * - * \section lwresutil_return Return Values - * - * Successful calls to lwres_string_parse() and lwres_addr_parse() - * return #LWRES_R_SUCCESS. Both functions return #LWRES_R_FAILURE if - * the buffer is corrupt or #LWRES_R_UNEXPECTEDEND if the buffer has - * less space than expected for the components of the encoded string - * or address. - * - * lwres_getaddrsbyname() returns #LWRES_R_SUCCESS on success and it - * returns #LWRES_R_NOTFOUND if the hostname name could not be found. - * - * #LWRES_R_SUCCESS is returned by a successful call to - * lwres_getnamebyaddr(). - * - * Both lwres_getaddrsbyname() and lwres_getnamebyaddr() return - * #LWRES_R_NOMEMORY when memory allocation requests fail and - * #LWRES_R_UNEXPECTEDEND if the buffers used for sending queries and - * receiving replies are too small. - * - * \section lwresutil_see See Also - * - * lwbuffer.c, lwres_gabn.c - */ - -#include <config.h> - -#include <assert.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include <lwres/lwbuffer.h> -#include <lwres/lwres.h> -#include <lwres/result.h> - -#include "assert_p.h" -#include "context_p.h" - -/*% Parse data. */ -/*! - * Requires: - * - * The "current" pointer in "b" points to encoded raw data. - * - * Ensures: - * - * The address of the first byte of the data is returned via "p", - * and the length is returned via "len". If NULL, they are not - * set. - * - * On return, the current pointer of "b" will point to the character - * following the data length and the data. - * - */ -lwres_result_t -lwres_data_parse(lwres_buffer_t *b, unsigned char **p, lwres_uint16_t *len) -{ - lwres_uint16_t datalen; - unsigned char *data; - - REQUIRE(b != NULL); - - /* - * Pull off the length (2 bytes) - */ - if (!SPACE_REMAINING(b, 2)) - return (LWRES_R_UNEXPECTEDEND); - datalen = lwres_buffer_getuint16(b); - - /* - * Set the pointer to this string to the right place, then - * advance the buffer pointer. - */ - if (!SPACE_REMAINING(b, datalen)) - return (LWRES_R_UNEXPECTEDEND); - data = b->base + b->current; - lwres_buffer_forward(b, datalen); - - if (len != NULL) - *len = datalen; - if (p != NULL) - *p = data; - - return (LWRES_R_SUCCESS); -} - -/*% Retrieves a DNS-encoded string. */ -/*! - * Requires: - * - * The "current" pointer in "b" point to an encoded string. - * - * Ensures: - * - * The address of the first byte of the string is returned via "c", - * and the length is returned via "len". If NULL, they are not - * set. - * - * On return, the current pointer of "b" will point to the character - * following the string length, the string, and the trailing NULL. - * - */ -lwres_result_t -lwres_string_parse(lwres_buffer_t *b, char **c, lwres_uint16_t *len) -{ - lwres_uint16_t datalen; - char *string; - - REQUIRE(b != NULL); - - /* - * Pull off the length (2 bytes) - */ - if (!SPACE_REMAINING(b, 2)) - return (LWRES_R_UNEXPECTEDEND); - datalen = lwres_buffer_getuint16(b); - - /* - * Set the pointer to this string to the right place, then - * advance the buffer pointer. - */ - if (!SPACE_REMAINING(b, datalen)) - return (LWRES_R_UNEXPECTEDEND); - string = (char *)b->base + b->current; - lwres_buffer_forward(b, datalen); - - /* - * Skip the "must be zero" byte. - */ - if (!SPACE_REMAINING(b, 1)) - return (LWRES_R_UNEXPECTEDEND); - if (0 != lwres_buffer_getuint8(b)) - return (LWRES_R_FAILURE); - - if (len != NULL) - *len = datalen; - if (c != NULL) - *c = string; - - return (LWRES_R_SUCCESS); -} - -/*% Extracts an address from the buffer b. */ -lwres_result_t -lwres_addr_parse(lwres_buffer_t *b, lwres_addr_t *addr) -{ - REQUIRE(addr != NULL); - - if (!SPACE_REMAINING(b, 6)) - return (LWRES_R_UNEXPECTEDEND); - - addr->family = lwres_buffer_getuint32(b); - addr->length = lwres_buffer_getuint16(b); - - if (!SPACE_REMAINING(b, addr->length)) - return (LWRES_R_UNEXPECTEDEND); - if (addr->length > LWRES_ADDR_MAXLEN) - return (LWRES_R_FAILURE); - - lwres_buffer_getmem(b, addr->address, addr->length); - - return (LWRES_R_SUCCESS); -} - -/*% Used to perform forward lookups. */ -lwres_result_t -lwres_getaddrsbyname(lwres_context_t *ctx, const char *name, - lwres_uint32_t addrtypes, lwres_gabnresponse_t **structp) -{ - lwres_gabnrequest_t request; - lwres_gabnresponse_t *response; - int ret; - int recvlen; - lwres_buffer_t b_in, b_out; - lwres_lwpacket_t pkt; - lwres_uint32_t serial; - char *buffer; - char target_name[1024]; - unsigned int target_length; - - REQUIRE(ctx != NULL); - REQUIRE(name != NULL); - REQUIRE(addrtypes != 0); - REQUIRE(structp != NULL && *structp == NULL); - - b_in.base = NULL; - b_out.base = NULL; - response = NULL; - buffer = NULL; - serial = lwres_context_nextserial(ctx); - - buffer = CTXMALLOC(LWRES_RECVLENGTH); - if (buffer == NULL) { - ret = LWRES_R_NOMEMORY; - goto out; - } - - target_length = strlen(name); - if (target_length >= sizeof(target_name)) - return (LWRES_R_FAILURE); - strcpy(target_name, name); /* strcpy is safe */ - - /* - * Set up our request and render it to a buffer. - */ - request.flags = 0; - request.addrtypes = addrtypes; - request.name = target_name; - request.namelen = target_length; - pkt.pktflags = 0; - pkt.serial = serial; - pkt.result = 0; - pkt.recvlength = LWRES_RECVLENGTH; - - again: - ret = lwres_gabnrequest_render(ctx, &request, &pkt, &b_out); - if (ret != LWRES_R_SUCCESS) - goto out; - - ret = lwres_context_sendrecv(ctx, b_out.base, b_out.length, buffer, - LWRES_RECVLENGTH, &recvlen); - if (ret != LWRES_R_SUCCESS) - goto out; - - lwres_buffer_init(&b_in, buffer, recvlen); - b_in.used = recvlen; - - /* - * Parse the packet header. - */ - ret = lwres_lwpacket_parseheader(&b_in, &pkt); - if (ret != LWRES_R_SUCCESS) - goto out; - - /* - * Sanity check. - */ - if (pkt.serial != serial) - goto again; - if (pkt.opcode != LWRES_OPCODE_GETADDRSBYNAME) - goto again; - - /* - * Free what we've transmitted - */ - CTXFREE(b_out.base, b_out.length); - b_out.base = NULL; - b_out.length = 0; - - if (pkt.result != LWRES_R_SUCCESS) { - ret = pkt.result; - goto out; - } - - /* - * Parse the response. - */ - ret = lwres_gabnresponse_parse(ctx, &b_in, &pkt, &response); - if (ret != LWRES_R_SUCCESS) - goto out; - response->base = buffer; - response->baselen = LWRES_RECVLENGTH; - buffer = NULL; /* don't free this below */ - - *structp = response; - return (LWRES_R_SUCCESS); - - out: - if (b_out.base != NULL) - CTXFREE(b_out.base, b_out.length); - if (buffer != NULL) - CTXFREE(buffer, LWRES_RECVLENGTH); - if (response != NULL) - lwres_gabnresponse_free(ctx, &response); - - return (ret); -} - - -/*% Used to perform reverse lookups. */ -lwres_result_t -lwres_getnamebyaddr(lwres_context_t *ctx, lwres_uint32_t addrtype, - lwres_uint16_t addrlen, const unsigned char *addr, - lwres_gnbaresponse_t **structp) -{ - lwres_gnbarequest_t request; - lwres_gnbaresponse_t *response; - int ret; - int recvlen; - lwres_buffer_t b_in, b_out; - lwres_lwpacket_t pkt; - lwres_uint32_t serial; - char *buffer; - - REQUIRE(ctx != NULL); - REQUIRE(addrtype != 0); - REQUIRE(addrlen != 0); - REQUIRE(addr != NULL); - REQUIRE(structp != NULL && *structp == NULL); - - b_in.base = NULL; - b_out.base = NULL; - response = NULL; - buffer = NULL; - serial = lwres_context_nextserial(ctx); - - buffer = CTXMALLOC(LWRES_RECVLENGTH); - if (buffer == NULL) { - ret = LWRES_R_NOMEMORY; - goto out; - } - - /* - * Set up our request and render it to a buffer. - */ - request.flags = 0; - request.addr.family = addrtype; - request.addr.length = addrlen; - memmove(request.addr.address, addr, addrlen); - pkt.pktflags = 0; - pkt.serial = serial; - pkt.result = 0; - pkt.recvlength = LWRES_RECVLENGTH; - - again: - ret = lwres_gnbarequest_render(ctx, &request, &pkt, &b_out); - if (ret != LWRES_R_SUCCESS) - goto out; - - ret = lwres_context_sendrecv(ctx, b_out.base, b_out.length, buffer, - LWRES_RECVLENGTH, &recvlen); - if (ret != LWRES_R_SUCCESS) - goto out; - - lwres_buffer_init(&b_in, buffer, recvlen); - b_in.used = recvlen; - - /* - * Parse the packet header. - */ - ret = lwres_lwpacket_parseheader(&b_in, &pkt); - if (ret != LWRES_R_SUCCESS) - goto out; - - /* - * Sanity check. - */ - if (pkt.serial != serial) - goto again; - if (pkt.opcode != LWRES_OPCODE_GETNAMEBYADDR) - goto again; - - /* - * Free what we've transmitted - */ - CTXFREE(b_out.base, b_out.length); - b_out.base = NULL; - b_out.length = 0; - - if (pkt.result != LWRES_R_SUCCESS) { - ret = pkt.result; - goto out; - } - - /* - * Parse the response. - */ - ret = lwres_gnbaresponse_parse(ctx, &b_in, &pkt, &response); - if (ret != LWRES_R_SUCCESS) - goto out; - response->base = buffer; - response->baselen = LWRES_RECVLENGTH; - buffer = NULL; /* don't free this below */ - - *structp = response; - return (LWRES_R_SUCCESS); - - out: - if (b_out.base != NULL) - CTXFREE(b_out.base, b_out.length); - if (buffer != NULL) - CTXFREE(buffer, LWRES_RECVLENGTH); - if (response != NULL) - lwres_gnbaresponse_free(ctx, &response); - - return (ret); -} - -/*% Get rdata by name. */ -lwres_result_t -lwres_getrdatabyname(lwres_context_t *ctx, const char *name, - lwres_uint16_t rdclass, lwres_uint16_t rdtype, - lwres_uint32_t flags, lwres_grbnresponse_t **structp) -{ - int ret; - int recvlen; - lwres_buffer_t b_in, b_out; - lwres_lwpacket_t pkt; - lwres_uint32_t serial; - char *buffer; - lwres_grbnrequest_t request; - lwres_grbnresponse_t *response; - char target_name[1024]; - unsigned int target_length; - - REQUIRE(ctx != NULL); - REQUIRE(name != NULL); - REQUIRE(structp != NULL && *structp == NULL); - - b_in.base = NULL; - b_out.base = NULL; - response = NULL; - buffer = NULL; - serial = lwres_context_nextserial(ctx); - - buffer = CTXMALLOC(LWRES_RECVLENGTH); - if (buffer == NULL) { - ret = LWRES_R_NOMEMORY; - goto out; - } - - target_length = strlen(name); - if (target_length >= sizeof(target_name)) - return (LWRES_R_FAILURE); - strcpy(target_name, name); /* strcpy is safe */ - - /* - * Set up our request and render it to a buffer. - */ - request.rdclass = rdclass; - request.rdtype = rdtype; - request.flags = flags; - request.name = target_name; - request.namelen = target_length; - pkt.pktflags = 0; - pkt.serial = serial; - pkt.result = 0; - pkt.recvlength = LWRES_RECVLENGTH; - - again: - ret = lwres_grbnrequest_render(ctx, &request, &pkt, &b_out); - if (ret != LWRES_R_SUCCESS) - goto out; - - ret = lwres_context_sendrecv(ctx, b_out.base, b_out.length, buffer, - LWRES_RECVLENGTH, &recvlen); - if (ret != LWRES_R_SUCCESS) - goto out; - - lwres_buffer_init(&b_in, buffer, recvlen); - b_in.used = recvlen; - - /* - * Parse the packet header. - */ - ret = lwres_lwpacket_parseheader(&b_in, &pkt); - if (ret != LWRES_R_SUCCESS) - goto out; - - /* - * Sanity check. - */ - if (pkt.serial != serial) - goto again; - if (pkt.opcode != LWRES_OPCODE_GETRDATABYNAME) - goto again; - - /* - * Free what we've transmitted - */ - CTXFREE(b_out.base, b_out.length); - b_out.base = NULL; - b_out.length = 0; - - if (pkt.result != LWRES_R_SUCCESS) { - ret = pkt.result; - goto out; - } - - /* - * Parse the response. - */ - ret = lwres_grbnresponse_parse(ctx, &b_in, &pkt, &response); - if (ret != LWRES_R_SUCCESS) - goto out; - response->base = buffer; - response->baselen = LWRES_RECVLENGTH; - buffer = NULL; /* don't free this below */ - - *structp = response; - return (LWRES_R_SUCCESS); - - out: - if (b_out.base != NULL) - CTXFREE(b_out.base, b_out.length); - if (buffer != NULL) - CTXFREE(buffer, LWRES_RECVLENGTH); - if (response != NULL) - lwres_grbnresponse_free(ctx, &response); - - return (ret); -} |