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Diffstat (limited to 'pjlib-util/src/pjlib-util/dns.c')
-rw-r--r--pjlib-util/src/pjlib-util/dns.c744
1 files changed, 744 insertions, 0 deletions
diff --git a/pjlib-util/src/pjlib-util/dns.c b/pjlib-util/src/pjlib-util/dns.c
new file mode 100644
index 0000000..56e3461
--- /dev/null
+++ b/pjlib-util/src/pjlib-util/dns.c
@@ -0,0 +1,744 @@
+/* $Id: dns.c 3553 2011-05-05 06:14:19Z nanang $ */
+/*
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <pjlib-util/dns.h>
+#include <pjlib-util/errno.h>
+#include <pj/assert.h>
+#include <pj/errno.h>
+#include <pj/pool.h>
+#include <pj/sock.h>
+#include <pj/string.h>
+
+
+PJ_DEF(const char *) pj_dns_get_type_name(int type)
+{
+ switch (type) {
+ case PJ_DNS_TYPE_A: return "A";
+ case PJ_DNS_TYPE_AAAA: return "AAAA";
+ case PJ_DNS_TYPE_SRV: return "SRV";
+ case PJ_DNS_TYPE_NS: return "NS";
+ case PJ_DNS_TYPE_CNAME: return "CNAME";
+ case PJ_DNS_TYPE_PTR: return "PTR";
+ case PJ_DNS_TYPE_MX: return "MX";
+ case PJ_DNS_TYPE_TXT: return "TXT";
+ case PJ_DNS_TYPE_NAPTR: return "NAPTR";
+ }
+ return "(Unknown)";
+}
+
+
+static void write16(pj_uint8_t *p, pj_uint16_t val)
+{
+ p[0] = (pj_uint8_t)(val >> 8);
+ p[1] = (pj_uint8_t)(val & 0xFF);
+}
+
+
+/**
+ * Initialize a DNS query transaction.
+ */
+PJ_DEF(pj_status_t) pj_dns_make_query( void *packet,
+ unsigned *size,
+ pj_uint16_t id,
+ int qtype,
+ const pj_str_t *name)
+{
+ pj_uint8_t *query, *p = (pj_uint8_t*)packet;
+ const char *startlabel, *endlabel, *endname;
+ unsigned d;
+
+ /* Sanity check */
+ PJ_ASSERT_RETURN(packet && size && qtype && name, PJ_EINVAL);
+
+ /* Calculate total number of bytes required. */
+ d = sizeof(pj_dns_hdr) + name->slen + 4;
+
+ /* Check that size is sufficient. */
+ PJ_ASSERT_RETURN(*size >= d, PJLIB_UTIL_EDNSQRYTOOSMALL);
+
+ /* Initialize header */
+ pj_assert(sizeof(pj_dns_hdr)==12);
+ pj_bzero(p, sizeof(struct pj_dns_hdr));
+ write16(p+0, id);
+ write16(p+2, (pj_uint16_t)PJ_DNS_SET_RD(1));
+ write16(p+4, (pj_uint16_t)1);
+
+ /* Initialize query */
+ query = p = ((pj_uint8_t*)packet)+sizeof(pj_dns_hdr);
+
+ /* Tokenize name */
+ startlabel = endlabel = name->ptr;
+ endname = name->ptr + name->slen;
+ while (endlabel != endname) {
+ while (endlabel != endname && *endlabel != '.')
+ ++endlabel;
+ *p++ = (pj_uint8_t)(endlabel - startlabel);
+ pj_memcpy(p, startlabel, endlabel-startlabel);
+ p += (endlabel-startlabel);
+ if (endlabel != endname && *endlabel == '.')
+ ++endlabel;
+ startlabel = endlabel;
+ }
+ *p++ = '\0';
+
+ /* Set type */
+ write16(p, (pj_uint16_t)qtype);
+ p += 2;
+
+ /* Set class (IN=1) */
+ write16(p, 1);
+ p += 2;
+
+ /* Done, calculate length */
+ *size = p - (pj_uint8_t*)packet;
+
+ return 0;
+}
+
+
+/* Get a name length (note: name consists of multiple labels and
+ * it may contain pointers when name compression is applied)
+ */
+static pj_status_t get_name_len(int rec_counter, const pj_uint8_t *pkt,
+ const pj_uint8_t *start, const pj_uint8_t *max,
+ int *parsed_len, int *name_len)
+{
+ const pj_uint8_t *p;
+ pj_status_t status;
+
+ /* Limit the number of recursion */
+ if (rec_counter > 10) {
+ /* Too many name recursion */
+ return PJLIB_UTIL_EDNSINNAMEPTR;
+ }
+
+ *name_len = *parsed_len = 0;
+ p = start;
+ while (*p) {
+ if ((*p & 0xc0) == 0xc0) {
+ /* Compression is found! */
+ int ptr_len = 0;
+ int dummy;
+ pj_uint16_t offset;
+
+ /* Get the 14bit offset */
+ pj_memcpy(&offset, p, 2);
+ offset ^= pj_htons((pj_uint16_t)(0xc0 << 8));
+ offset = pj_ntohs(offset);
+
+ /* Check that offset is valid */
+ if (offset >= max - pkt)
+ return PJLIB_UTIL_EDNSINNAMEPTR;
+
+ /* Get the name length from that offset. */
+ status = get_name_len(rec_counter+1, pkt, pkt + offset, max,
+ &dummy, &ptr_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ *parsed_len += 2;
+ *name_len += ptr_len;
+
+ return PJ_SUCCESS;
+ } else {
+ unsigned label_len = *p;
+
+ /* Check that label length is valid */
+ if (pkt+label_len > max)
+ return PJLIB_UTIL_EDNSINNAMEPTR;
+
+ p += (label_len + 1);
+ *parsed_len += (label_len + 1);
+
+ if (*p != 0)
+ ++label_len;
+
+ *name_len += label_len;
+
+ if (p >= max)
+ return PJLIB_UTIL_EDNSINSIZE;
+ }
+ }
+ ++p;
+ (*parsed_len)++;
+
+ return PJ_SUCCESS;
+}
+
+
+/* Parse and copy name (note: name consists of multiple labels and
+ * it may contain pointers when compression is applied).
+ */
+static pj_status_t get_name(int rec_counter, const pj_uint8_t *pkt,
+ const pj_uint8_t *start, const pj_uint8_t *max,
+ pj_str_t *name)
+{
+ const pj_uint8_t *p;
+ pj_status_t status;
+
+ /* Limit the number of recursion */
+ if (rec_counter > 10) {
+ /* Too many name recursion */
+ return PJLIB_UTIL_EDNSINNAMEPTR;
+ }
+
+ p = start;
+ while (*p) {
+ if ((*p & 0xc0) == 0xc0) {
+ /* Compression is found! */
+ pj_uint16_t offset;
+
+ /* Get the 14bit offset */
+ pj_memcpy(&offset, p, 2);
+ offset ^= pj_htons((pj_uint16_t)(0xc0 << 8));
+ offset = pj_ntohs(offset);
+
+ /* Check that offset is valid */
+ if (offset >= max - pkt)
+ return PJLIB_UTIL_EDNSINNAMEPTR;
+
+ /* Retrieve the name from that offset. */
+ status = get_name(rec_counter+1, pkt, pkt + offset, max, name);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ return PJ_SUCCESS;
+ } else {
+ unsigned label_len = *p;
+
+ /* Check that label length is valid */
+ if (pkt+label_len > max)
+ return PJLIB_UTIL_EDNSINNAMEPTR;
+
+ pj_memcpy(name->ptr + name->slen, p+1, label_len);
+ name->slen += label_len;
+
+ p += label_len + 1;
+ if (*p != 0) {
+ *(name->ptr + name->slen) = '.';
+ ++name->slen;
+ }
+
+ if (p >= max)
+ return PJLIB_UTIL_EDNSINSIZE;
+ }
+ }
+
+ return PJ_SUCCESS;
+}
+
+
+/* Parse query records. */
+static pj_status_t parse_query(pj_dns_parsed_query *q, pj_pool_t *pool,
+ const pj_uint8_t *pkt, const pj_uint8_t *start,
+ const pj_uint8_t *max, int *parsed_len)
+{
+ const pj_uint8_t *p = start;
+ int name_len, name_part_len;
+ pj_status_t status;
+
+ /* Get the length of the name */
+ status = get_name_len(0, pkt, start, max, &name_part_len, &name_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ /* Allocate memory for the name */
+ q->name.ptr = (char*) pj_pool_alloc(pool, name_len+4);
+ q->name.slen = 0;
+
+ /* Get the name */
+ status = get_name(0, pkt, start, max, &q->name);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ p = (start + name_part_len);
+
+ /* Get the type */
+ pj_memcpy(&q->type, p, 2);
+ q->type = pj_ntohs(q->type);
+ p += 2;
+
+ /* Get the class */
+ pj_memcpy(&q->dnsclass, p, 2);
+ q->dnsclass = pj_ntohs(q->dnsclass);
+ p += 2;
+
+ *parsed_len = (int)(p - start);
+
+ return PJ_SUCCESS;
+}
+
+
+/* Parse RR records */
+static pj_status_t parse_rr(pj_dns_parsed_rr *rr, pj_pool_t *pool,
+ const pj_uint8_t *pkt,
+ const pj_uint8_t *start, const pj_uint8_t *max,
+ int *parsed_len)
+{
+ const pj_uint8_t *p = start;
+ int name_len, name_part_len;
+ pj_status_t status;
+
+ /* Get the length of the name */
+ status = get_name_len(0, pkt, start, max, &name_part_len, &name_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ /* Allocate memory for the name */
+ rr->name.ptr = (char*) pj_pool_alloc(pool, name_len+4);
+ rr->name.slen = 0;
+
+ /* Get the name */
+ status = get_name(0, pkt, start, max, &rr->name);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ p = (start + name_part_len);
+
+ /* Check the size can accomodate next few fields. */
+ if (p+10 > max)
+ return PJLIB_UTIL_EDNSINSIZE;
+
+ /* Get the type */
+ pj_memcpy(&rr->type, p, 2);
+ rr->type = pj_ntohs(rr->type);
+ p += 2;
+
+ /* Get the class */
+ pj_memcpy(&rr->dnsclass, p, 2);
+ rr->dnsclass = pj_ntohs(rr->dnsclass);
+ p += 2;
+
+ /* Class MUST be IN */
+ if (rr->dnsclass != 1)
+ return PJLIB_UTIL_EDNSINCLASS;
+
+ /* Get TTL */
+ pj_memcpy(&rr->ttl, p, 4);
+ rr->ttl = pj_ntohl(rr->ttl);
+ p += 4;
+
+ /* Get rdlength */
+ pj_memcpy(&rr->rdlength, p, 2);
+ rr->rdlength = pj_ntohs(rr->rdlength);
+ p += 2;
+
+ /* Check that length is valid */
+ if (p + rr->rdlength > max)
+ return PJLIB_UTIL_EDNSINSIZE;
+
+ /* Parse some well known records */
+ if (rr->type == PJ_DNS_TYPE_A) {
+ pj_memcpy(&rr->rdata.a.ip_addr, p, 4);
+ p += 4;
+
+ } else if (rr->type == PJ_DNS_TYPE_AAAA) {
+ pj_memcpy(&rr->rdata.aaaa.ip_addr, p, 16);
+ p += 16;
+
+ } else if (rr->type == PJ_DNS_TYPE_CNAME ||
+ rr->type == PJ_DNS_TYPE_NS ||
+ rr->type == PJ_DNS_TYPE_PTR)
+ {
+
+ /* Get the length of the target name */
+ status = get_name_len(0, pkt, p, max, &name_part_len, &name_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ /* Allocate memory for the name */
+ rr->rdata.cname.name.ptr = (char*) pj_pool_alloc(pool, name_len);
+ rr->rdata.cname.name.slen = 0;
+
+ /* Get the name */
+ status = get_name(0, pkt, p, max, &rr->rdata.cname.name);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ p += name_part_len;
+
+ } else if (rr->type == PJ_DNS_TYPE_SRV) {
+
+ /* Priority */
+ pj_memcpy(&rr->rdata.srv.prio, p, 2);
+ rr->rdata.srv.prio = pj_ntohs(rr->rdata.srv.prio);
+ p += 2;
+
+ /* Weight */
+ pj_memcpy(&rr->rdata.srv.weight, p, 2);
+ rr->rdata.srv.weight = pj_ntohs(rr->rdata.srv.weight);
+ p += 2;
+
+ /* Port */
+ pj_memcpy(&rr->rdata.srv.port, p, 2);
+ rr->rdata.srv.port = pj_ntohs(rr->rdata.srv.port);
+ p += 2;
+
+ /* Get the length of the target name */
+ status = get_name_len(0, pkt, p, max, &name_part_len, &name_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ /* Allocate memory for the name */
+ rr->rdata.srv.target.ptr = (char*) pj_pool_alloc(pool, name_len);
+ rr->rdata.srv.target.slen = 0;
+
+ /* Get the name */
+ status = get_name(0, pkt, p, max, &rr->rdata.srv.target);
+ if (status != PJ_SUCCESS)
+ return status;
+ p += name_part_len;
+
+ } else {
+ /* Copy the raw data */
+ rr->data = pj_pool_alloc(pool, rr->rdlength);
+ pj_memcpy(rr->data, p, rr->rdlength);
+
+ p += rr->rdlength;
+ }
+
+ *parsed_len = (int)(p - start);
+ return PJ_SUCCESS;
+}
+
+
+/*
+ * Parse raw DNS packet into DNS packet structure.
+ */
+PJ_DEF(pj_status_t) pj_dns_parse_packet( pj_pool_t *pool,
+ const void *packet,
+ unsigned size,
+ pj_dns_parsed_packet **p_res)
+{
+ pj_dns_parsed_packet *res;
+ const pj_uint8_t *start, *end;
+ pj_status_t status;
+ unsigned i;
+
+ /* Sanity checks */
+ PJ_ASSERT_RETURN(pool && packet && size && p_res, PJ_EINVAL);
+
+ /* Packet size must be at least as big as the header */
+ if (size < sizeof(pj_dns_hdr))
+ return PJLIB_UTIL_EDNSINSIZE;
+
+ /* Create the structure */
+ res = PJ_POOL_ZALLOC_T(pool, pj_dns_parsed_packet);
+
+ /* Copy the DNS header, and convert endianness to host byte order */
+ pj_memcpy(&res->hdr, packet, sizeof(pj_dns_hdr));
+ res->hdr.id = pj_ntohs(res->hdr.id);
+ res->hdr.flags = pj_ntohs(res->hdr.flags);
+ res->hdr.qdcount = pj_ntohs(res->hdr.qdcount);
+ res->hdr.anscount = pj_ntohs(res->hdr.anscount);
+ res->hdr.nscount = pj_ntohs(res->hdr.nscount);
+ res->hdr.arcount = pj_ntohs(res->hdr.arcount);
+
+ /* Mark start and end of payload */
+ start = ((const pj_uint8_t*)packet) + sizeof(pj_dns_hdr);
+ end = ((const pj_uint8_t*)packet) + size;
+
+ /* Parse query records (if any).
+ */
+ if (res->hdr.qdcount) {
+ res->q = (pj_dns_parsed_query*)
+ pj_pool_zalloc(pool, res->hdr.qdcount *
+ sizeof(pj_dns_parsed_query));
+ for (i=0; i<res->hdr.qdcount; ++i) {
+ int parsed_len = 0;
+
+ status = parse_query(&res->q[i], pool, (const pj_uint8_t*)packet,
+ start, end, &parsed_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ start += parsed_len;
+ }
+ }
+
+ /* Parse answer, if any */
+ if (res->hdr.anscount) {
+ res->ans = (pj_dns_parsed_rr*)
+ pj_pool_zalloc(pool, res->hdr.anscount *
+ sizeof(pj_dns_parsed_rr));
+
+ for (i=0; i<res->hdr.anscount; ++i) {
+ int parsed_len;
+
+ status = parse_rr(&res->ans[i], pool, (const pj_uint8_t*)packet,
+ start, end, &parsed_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ start += parsed_len;
+ }
+ }
+
+ /* Parse authoritative NS records, if any */
+ if (res->hdr.nscount) {
+ res->ns = (pj_dns_parsed_rr*)
+ pj_pool_zalloc(pool, res->hdr.nscount *
+ sizeof(pj_dns_parsed_rr));
+
+ for (i=0; i<res->hdr.nscount; ++i) {
+ int parsed_len;
+
+ status = parse_rr(&res->ns[i], pool, (const pj_uint8_t*)packet,
+ start, end, &parsed_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ start += parsed_len;
+ }
+ }
+
+ /* Parse additional RR answer, if any */
+ if (res->hdr.arcount) {
+ res->arr = (pj_dns_parsed_rr*)
+ pj_pool_zalloc(pool, res->hdr.arcount *
+ sizeof(pj_dns_parsed_rr));
+
+ for (i=0; i<res->hdr.arcount; ++i) {
+ int parsed_len;
+
+ status = parse_rr(&res->arr[i], pool, (const pj_uint8_t*)packet,
+ start, end, &parsed_len);
+ if (status != PJ_SUCCESS)
+ return status;
+
+ start += parsed_len;
+ }
+ }
+
+ /* Looks like everything is okay */
+ *p_res = res;
+
+ return PJ_SUCCESS;
+}
+
+
+/* Perform name compression scheme.
+ * If a name is already in the nametable, when no need to duplicate
+ * the string with the pool, but rather just use the pointer there.
+ */
+static void apply_name_table( unsigned *count,
+ pj_str_t nametable[],
+ const pj_str_t *src,
+ pj_pool_t *pool,
+ pj_str_t *dst)
+{
+ unsigned i;
+
+ /* Scan strings in nametable */
+ for (i=0; i<*count; ++i) {
+ if (pj_stricmp(&nametable[i], src) == 0)
+ break;
+ }
+
+ /* If name is found in nametable, use the pointer in the nametable */
+ if (i != *count) {
+ dst->ptr = nametable[i].ptr;
+ dst->slen = nametable[i].slen;
+ return;
+ }
+
+ /* Otherwise duplicate the string, and insert new name in nametable */
+ pj_strdup(pool, dst, src);
+
+ if (*count < PJ_DNS_MAX_NAMES_IN_NAMETABLE) {
+ nametable[*count].ptr = dst->ptr;
+ nametable[*count].slen = dst->slen;
+
+ ++(*count);
+ }
+}
+
+static void copy_query(pj_pool_t *pool, pj_dns_parsed_query *dst,
+ const pj_dns_parsed_query *src,
+ unsigned *nametable_count,
+ pj_str_t nametable[])
+{
+ pj_memcpy(dst, src, sizeof(*src));
+ apply_name_table(nametable_count, nametable, &src->name, pool, &dst->name);
+}
+
+
+static void copy_rr(pj_pool_t *pool, pj_dns_parsed_rr *dst,
+ const pj_dns_parsed_rr *src,
+ unsigned *nametable_count,
+ pj_str_t nametable[])
+{
+ pj_memcpy(dst, src, sizeof(*src));
+ apply_name_table(nametable_count, nametable, &src->name, pool, &dst->name);
+
+ if (src->data) {
+ dst->data = pj_pool_alloc(pool, src->rdlength);
+ pj_memcpy(dst->data, src->data, src->rdlength);
+ }
+
+ if (src->type == PJ_DNS_TYPE_SRV) {
+ apply_name_table(nametable_count, nametable, &src->rdata.srv.target,
+ pool, &dst->rdata.srv.target);
+ } else if (src->type == PJ_DNS_TYPE_A) {
+ dst->rdata.a.ip_addr.s_addr = src->rdata.a.ip_addr.s_addr;
+ } else if (src->type == PJ_DNS_TYPE_AAAA) {
+ pj_memcpy(&dst->rdata.aaaa.ip_addr, &src->rdata.aaaa.ip_addr,
+ sizeof(pj_in6_addr));
+ } else if (src->type == PJ_DNS_TYPE_CNAME) {
+ pj_strdup(pool, &dst->rdata.cname.name, &src->rdata.cname.name);
+ } else if (src->type == PJ_DNS_TYPE_NS) {
+ pj_strdup(pool, &dst->rdata.ns.name, &src->rdata.ns.name);
+ } else if (src->type == PJ_DNS_TYPE_PTR) {
+ pj_strdup(pool, &dst->rdata.ptr.name, &src->rdata.ptr.name);
+ }
+}
+
+/*
+ * Duplicate DNS packet.
+ */
+PJ_DEF(void) pj_dns_packet_dup(pj_pool_t *pool,
+ const pj_dns_parsed_packet*p,
+ unsigned options,
+ pj_dns_parsed_packet **p_dst)
+{
+ pj_dns_parsed_packet *dst;
+ unsigned nametable_count = 0;
+#if PJ_DNS_MAX_NAMES_IN_NAMETABLE
+ pj_str_t nametable[PJ_DNS_MAX_NAMES_IN_NAMETABLE];
+#else
+ pj_str_t *nametable = NULL;
+#endif
+ unsigned i;
+
+ PJ_ASSERT_ON_FAIL(pool && p && p_dst, return);
+
+ /* Create packet and copy header */
+ *p_dst = dst = PJ_POOL_ZALLOC_T(pool, pj_dns_parsed_packet);
+ pj_memcpy(&dst->hdr, &p->hdr, sizeof(p->hdr));
+
+ /* Initialize section counts in the target packet to zero.
+ * If memory allocation fails during copying process, the target packet
+ * should have a correct section counts.
+ */
+ dst->hdr.qdcount = 0;
+ dst->hdr.anscount = 0;
+ dst->hdr.nscount = 0;
+ dst->hdr.arcount = 0;
+
+
+ /* Copy query section */
+ if (p->hdr.qdcount && (options & PJ_DNS_NO_QD)==0) {
+ dst->q = (pj_dns_parsed_query*)
+ pj_pool_alloc(pool, p->hdr.qdcount *
+ sizeof(pj_dns_parsed_query));
+ for (i=0; i<p->hdr.qdcount; ++i) {
+ copy_query(pool, &dst->q[i], &p->q[i],
+ &nametable_count, nametable);
+ ++dst->hdr.qdcount;
+ }
+ }
+
+ /* Copy answer section */
+ if (p->hdr.anscount && (options & PJ_DNS_NO_ANS)==0) {
+ dst->ans = (pj_dns_parsed_rr*)
+ pj_pool_alloc(pool, p->hdr.anscount *
+ sizeof(pj_dns_parsed_rr));
+ for (i=0; i<p->hdr.anscount; ++i) {
+ copy_rr(pool, &dst->ans[i], &p->ans[i],
+ &nametable_count, nametable);
+ ++dst->hdr.anscount;
+ }
+ }
+
+ /* Copy NS section */
+ if (p->hdr.nscount && (options & PJ_DNS_NO_NS)==0) {
+ dst->ns = (pj_dns_parsed_rr*)
+ pj_pool_alloc(pool, p->hdr.nscount *
+ sizeof(pj_dns_parsed_rr));
+ for (i=0; i<p->hdr.nscount; ++i) {
+ copy_rr(pool, &dst->ns[i], &p->ns[i],
+ &nametable_count, nametable);
+ ++dst->hdr.nscount;
+ }
+ }
+
+ /* Copy additional info section */
+ if (p->hdr.arcount && (options & PJ_DNS_NO_AR)==0) {
+ dst->arr = (pj_dns_parsed_rr*)
+ pj_pool_alloc(pool, p->hdr.arcount *
+ sizeof(pj_dns_parsed_rr));
+ for (i=0; i<p->hdr.arcount; ++i) {
+ copy_rr(pool, &dst->arr[i], &p->arr[i],
+ &nametable_count, nametable);
+ ++dst->hdr.arcount;
+ }
+ }
+}
+
+
+PJ_DEF(void) pj_dns_init_srv_rr( pj_dns_parsed_rr *rec,
+ const pj_str_t *res_name,
+ unsigned dnsclass,
+ unsigned ttl,
+ unsigned prio,
+ unsigned weight,
+ unsigned port,
+ const pj_str_t *target)
+{
+ pj_bzero(rec, sizeof(*rec));
+ rec->name = *res_name;
+ rec->type = PJ_DNS_TYPE_SRV;
+ rec->dnsclass = (pj_uint16_t) dnsclass;
+ rec->ttl = ttl;
+ rec->rdata.srv.prio = (pj_uint16_t) prio;
+ rec->rdata.srv.weight = (pj_uint16_t) weight;
+ rec->rdata.srv.port = (pj_uint16_t) port;
+ rec->rdata.srv.target = *target;
+}
+
+
+PJ_DEF(void) pj_dns_init_cname_rr( pj_dns_parsed_rr *rec,
+ const pj_str_t *res_name,
+ unsigned dnsclass,
+ unsigned ttl,
+ const pj_str_t *name)
+{
+ pj_bzero(rec, sizeof(*rec));
+ rec->name = *res_name;
+ rec->type = PJ_DNS_TYPE_CNAME;
+ rec->dnsclass = (pj_uint16_t) dnsclass;
+ rec->ttl = ttl;
+ rec->rdata.cname.name = *name;
+}
+
+
+PJ_DEF(void) pj_dns_init_a_rr( pj_dns_parsed_rr *rec,
+ const pj_str_t *res_name,
+ unsigned dnsclass,
+ unsigned ttl,
+ const pj_in_addr *ip_addr)
+{
+ pj_bzero(rec, sizeof(*rec));
+ rec->name = *res_name;
+ rec->type = PJ_DNS_TYPE_A;
+ rec->dnsclass = (pj_uint16_t) dnsclass;
+ rec->ttl = ttl;
+ rec->rdata.a.ip_addr = *ip_addr;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-13 17:56:23 +0000