From c5544522f6409095627dc3d1129560195ab4ec40 Mon Sep 17 00:00:00 2001 From: Trent Lloyd Date: Sat, 4 Jun 2005 18:56:52 +0000 Subject: * Split out a fair bit of avahi-core into avahi-common for use by the client library git-svn-id: file:///home/lennart/svn/public/avahi/trunk@98 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe --- avahi-core/dns.c | 744 ------------------------------------------------------- 1 file changed, 744 deletions(-) delete mode 100644 avahi-core/dns.c (limited to 'avahi-core/dns.c') diff --git a/avahi-core/dns.c b/avahi-core/dns.c deleted file mode 100644 index 9e19c9e..0000000 --- a/avahi-core/dns.c +++ /dev/null @@ -1,744 +0,0 @@ -/* $Id$ */ - -/*** - This file is part of avahi. - - avahi is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as - published by the Free Software Foundation; either version 2.1 of the - License, or (at your option) any later version. - - avahi 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 Lesser General - Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with avahi; if not, write to the Free Software - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 - USA. -***/ - -#ifdef HAVE_CONFIG_H -#include -#endif - -#include - -#include -#include -#include - -#include "dns.h" -#include "util.h" - -AvahiDnsPacket* avahi_dns_packet_new(guint mtu) { - AvahiDnsPacket *p; - guint max_size; - - if (mtu <= 0) - max_size = AVAHI_DNS_PACKET_MAX_SIZE; - else if (mtu >= AVAHI_DNS_PACKET_EXTRA_SIZE) - max_size = mtu - AVAHI_DNS_PACKET_EXTRA_SIZE; - else - max_size = 0; - - if (max_size < AVAHI_DNS_PACKET_HEADER_SIZE) - max_size = AVAHI_DNS_PACKET_HEADER_SIZE; - - p = g_malloc(sizeof(AvahiDnsPacket) + max_size); - p->size = p->rindex = AVAHI_DNS_PACKET_HEADER_SIZE; - p->max_size = max_size; - p->name_table = NULL; - - memset(AVAHI_DNS_PACKET_DATA(p), 0, p->size); - return p; -} - -AvahiDnsPacket* avahi_dns_packet_new_query(guint mtu) { - AvahiDnsPacket *p; - - p = avahi_dns_packet_new(mtu); - avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_FLAGS, AVAHI_DNS_FLAGS(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)); - return p; -} - -AvahiDnsPacket* avahi_dns_packet_new_response(guint mtu, gboolean aa) { - AvahiDnsPacket *p; - - p = avahi_dns_packet_new(mtu); - avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_FLAGS, AVAHI_DNS_FLAGS(1, 0, aa, 0, 0, 0, 0, 0, 0, 0)); - return p; -} - -AvahiDnsPacket* avahi_dns_packet_new_reply(AvahiDnsPacket* p, guint mtu, gboolean copy_queries, gboolean aa) { - AvahiDnsPacket *r; - g_assert(p); - - r = avahi_dns_packet_new_response(mtu, aa); - - if (copy_queries) { - guint n, saved_rindex; - - saved_rindex = p->rindex; - p->rindex = AVAHI_DNS_PACKET_HEADER_SIZE; - - for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n--) { - AvahiKey *k; - gboolean unicast_response; - - if ((k = avahi_dns_packet_consume_key(p, &unicast_response))) { - avahi_dns_packet_append_key(r, k, unicast_response); - avahi_key_unref(k); - } - } - - p->rindex = saved_rindex; - - avahi_dns_packet_set_field(r, AVAHI_DNS_FIELD_QDCOUNT, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT)); - } - - avahi_dns_packet_set_field(r, AVAHI_DNS_FIELD_ID, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID)); - - avahi_dns_packet_set_field(r, AVAHI_DNS_FIELD_FLAGS, - (avahi_dns_packet_get_field(r, AVAHI_DNS_FIELD_FLAGS) & ~AVAHI_DNS_FLAG_OPCODE) | - (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_OPCODE)); - - return r; -} - - -void avahi_dns_packet_free(AvahiDnsPacket *p) { - g_assert(p); - - if (p->name_table) - g_hash_table_destroy(p->name_table); - - g_free(p); -} - -void avahi_dns_packet_set_field(AvahiDnsPacket *p, guint index, guint16 v) { - g_assert(p); - g_assert(index < AVAHI_DNS_PACKET_HEADER_SIZE); - - ((guint16*) AVAHI_DNS_PACKET_DATA(p))[index] = g_htons(v); -} - -guint16 avahi_dns_packet_get_field(AvahiDnsPacket *p, guint index) { - g_assert(p); - g_assert(index < AVAHI_DNS_PACKET_HEADER_SIZE); - - return g_ntohs(((guint16*) AVAHI_DNS_PACKET_DATA(p))[index]); -} - -void avahi_dns_packet_inc_field(AvahiDnsPacket *p, guint index) { - g_assert(p); - - avahi_dns_packet_set_field(p, index, avahi_dns_packet_get_field(p, index) + 1); -} - -guint8* avahi_dns_packet_append_name(AvahiDnsPacket *p, const gchar *name) { - guint8 *d, *saved_ptr = NULL; - guint saved_size; - - g_assert(p); - g_assert(name); - - saved_size = p->size; - saved_ptr = avahi_dns_packet_extend(p, 0); - - while (*name) { - guint8* prev; - const gchar *pname; - gchar label[64]; - - /* Check whether we can compress this name. */ - - if (p->name_table && (prev = g_hash_table_lookup(p->name_table, name))) { - guint index; - - g_assert(prev >= AVAHI_DNS_PACKET_DATA(p)); - index = (guint) (prev - AVAHI_DNS_PACKET_DATA(p)); - - g_assert(index < p->size); - - if (index < 0x4000) { - guint16 *t; - if (!(t = (guint16*) avahi_dns_packet_extend(p, sizeof(guint16)))) - return NULL; - - *t = g_htons((0xC000 | index)); - return saved_ptr; - } - } - - pname = name; - - if (!(avahi_unescape_label(&name, label, sizeof(label)))) - goto fail; - - if (!(d = avahi_dns_packet_append_string(p, label))) - goto fail; - - if (!p->name_table) - /* This works only for normalized domain names */ - p->name_table = g_hash_table_new_full((GHashFunc) g_str_hash, (GEqualFunc) g_str_equal, g_free, NULL); - - g_hash_table_insert(p->name_table, g_strdup(pname), d); - } - - if (!(d = avahi_dns_packet_extend(p, 1))) - goto fail; - - *d = 0; - - return saved_ptr; - -fail: - p->size = saved_size; - return NULL; -} - -guint8* avahi_dns_packet_append_uint16(AvahiDnsPacket *p, guint16 v) { - guint8 *d; - g_assert(p); - - if (!(d = avahi_dns_packet_extend(p, sizeof(guint16)))) - return NULL; - - *((guint16*) d) = g_htons(v); - return d; -} - -guint8 *avahi_dns_packet_append_uint32(AvahiDnsPacket *p, guint32 v) { - guint8 *d; - g_assert(p); - - if (!(d = avahi_dns_packet_extend(p, sizeof(guint32)))) - return NULL; - - *((guint32*) d) = g_htonl(v); - - return d; -} - -guint8 *avahi_dns_packet_append_bytes(AvahiDnsPacket *p, gconstpointer b, guint l) { - guint8* d; - - g_assert(p); - g_assert(b); - g_assert(l); - - if (!(d = avahi_dns_packet_extend(p, l))) - return NULL; - - memcpy(d, b, l); - return d; -} - -guint8* avahi_dns_packet_append_string(AvahiDnsPacket *p, const gchar *s) { - guint8* d; - guint k; - - g_assert(p); - g_assert(s); - - if ((k = strlen(s)) >= 255) - k = 255; - - if (!(d = avahi_dns_packet_extend(p, k+1))) - return NULL; - - *d = (guint8) k; - memcpy(d+1, s, k); - - return d; -} - -guint8 *avahi_dns_packet_extend(AvahiDnsPacket *p, guint l) { - guint8 *d; - - g_assert(p); - - if (p->size+l > p->max_size) - return NULL; - - d = AVAHI_DNS_PACKET_DATA(p) + p->size; - p->size += l; - - return d; -} - -gint avahi_dns_packet_check_valid(AvahiDnsPacket *p) { - guint16 flags; - g_assert(p); - - if (p->size < 12) - return -1; - - flags = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS); - - if (flags & AVAHI_DNS_FLAG_OPCODE || flags & AVAHI_DNS_FLAG_RCODE) - return -1; - - return 0; -} - -gint avahi_dns_packet_is_query(AvahiDnsPacket *p) { - g_assert(p); - - return !(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_QR); -} - -static gint consume_labels(AvahiDnsPacket *p, guint index, gchar *ret_name, guint l) { - gint ret = 0; - int compressed = 0; - int first_label = 1; - g_assert(p && ret_name && l); - - for (;;) { - guint8 n; - - if (index+1 > p->size) - return -1; - - n = AVAHI_DNS_PACKET_DATA(p)[index]; - - if (!n) { - index++; - if (!compressed) - ret++; - - if (l < 1) - return -1; - *ret_name = 0; - - return ret; - - } else if (n <= 63) { - /* Uncompressed label */ - index++; - if (!compressed) - ret++; - - if (index + n > p->size) - return -1; - - if ((guint) n + 1 > l) - return -1; - - if (!first_label) { - *(ret_name++) = '.'; - l--; - } else - first_label = 0; - - if (!(avahi_escape_label(AVAHI_DNS_PACKET_DATA(p) + index, n, &ret_name, &l))) - return -1; - - index += n; - - if (!compressed) - ret += n; - } else if ((n & 0xC0) == 0xC0) { - /* Compressed label */ - - if (index+2 > p->size) - return -1; - - index = ((guint) (AVAHI_DNS_PACKET_DATA(p)[index] & ~0xC0)) << 8 | AVAHI_DNS_PACKET_DATA(p)[index+1]; - - if (!compressed) - ret += 2; - - compressed = 1; - } else - return -1; - } -} - -gint avahi_dns_packet_consume_name(AvahiDnsPacket *p, gchar *ret_name, guint l) { - gint r; - - if ((r = consume_labels(p, p->rindex, ret_name, l)) < 0) - return -1; - - p->rindex += r; - return 0; -} - -gint avahi_dns_packet_consume_uint16(AvahiDnsPacket *p, guint16 *ret_v) { - g_assert(p); - g_assert(ret_v); - - if (p->rindex + sizeof(guint16) > p->size) - return -1; - - *ret_v = g_ntohs(*((guint16*) (AVAHI_DNS_PACKET_DATA(p) + p->rindex))); - p->rindex += sizeof(guint16); - - return 0; -} - -gint avahi_dns_packet_consume_uint32(AvahiDnsPacket *p, guint32 *ret_v) { - g_assert(p); - g_assert(ret_v); - - if (p->rindex + sizeof(guint32) > p->size) - return -1; - - *ret_v = g_ntohl(*((guint32*) (AVAHI_DNS_PACKET_DATA(p) + p->rindex))); - p->rindex += sizeof(guint32); - - return 0; -} - -gint avahi_dns_packet_consume_bytes(AvahiDnsPacket *p, gpointer ret_data, guint l) { - g_assert(p); - g_assert(ret_data); - g_assert(l > 0); - - if (p->rindex + l > p->size) - return -1; - - memcpy(ret_data, AVAHI_DNS_PACKET_DATA(p) + p->rindex, l); - p->rindex += l; - - return 0; -} - -gint avahi_dns_packet_consume_string(AvahiDnsPacket *p, gchar *ret_string, guint l) { - guint k; - - g_assert(p); - g_assert(ret_string); - g_assert(l > 0); - - if (p->rindex >= p->size) - return -1; - - k = AVAHI_DNS_PACKET_DATA(p)[p->rindex]; - - if (p->rindex+1+k > p->size) - return -1; - - if (l > k+1) - l = k+1; - - memcpy(ret_string, AVAHI_DNS_PACKET_DATA(p)+p->rindex+1, l-1); - ret_string[l-1] = 0; - - - p->rindex += 1+k; - - return 0; - -} - -gconstpointer avahi_dns_packet_get_rptr(AvahiDnsPacket *p) { - g_assert(p); - - if (p->rindex > p->size) - return NULL; - - return AVAHI_DNS_PACKET_DATA(p) + p->rindex; -} - -gint avahi_dns_packet_skip(AvahiDnsPacket *p, guint length) { - g_assert(p); - - if (p->rindex + length > p->size) - return -1; - - p->rindex += length; - return 0; -} - -AvahiRecord* avahi_dns_packet_consume_record(AvahiDnsPacket *p, gboolean *ret_cache_flush) { - gchar name[257], buf[257]; - guint16 type, class; - guint32 ttl; - guint16 rdlength; - AvahiRecord *r = NULL; - gconstpointer start; - - g_assert(p); - g_assert(ret_cache_flush); - -/* g_message("consume_record()"); */ - - if (avahi_dns_packet_consume_name(p, name, sizeof(name)) < 0 || - avahi_dns_packet_consume_uint16(p, &type) < 0 || - avahi_dns_packet_consume_uint16(p, &class) < 0 || - avahi_dns_packet_consume_uint32(p, &ttl) < 0 || - avahi_dns_packet_consume_uint16(p, &rdlength) < 0 || - p->rindex + rdlength > p->size) - goto fail; - -/* g_message("name = %s, rdlength = %u", name, rdlength); */ - - *ret_cache_flush = !!(class & AVAHI_DNS_CACHE_FLUSH); - class &= ~AVAHI_DNS_CACHE_FLUSH; - - start = avahi_dns_packet_get_rptr(p); - - r = avahi_record_new_full(name, class, type); - - switch (type) { - case AVAHI_DNS_TYPE_PTR: - case AVAHI_DNS_TYPE_CNAME: - -/* g_message("ptr"); */ - - if (avahi_dns_packet_consume_name(p, buf, sizeof(buf)) < 0) - goto fail; - - r->data.ptr.name = g_strdup(buf); - break; - - - case AVAHI_DNS_TYPE_SRV: - -/* g_message("srv"); */ - - if (avahi_dns_packet_consume_uint16(p, &r->data.srv.priority) < 0 || - avahi_dns_packet_consume_uint16(p, &r->data.srv.weight) < 0 || - avahi_dns_packet_consume_uint16(p, &r->data.srv.port) < 0 || - avahi_dns_packet_consume_name(p, buf, sizeof(buf)) < 0) - goto fail; - - r->data.srv.name = g_strdup(buf); - break; - - case AVAHI_DNS_TYPE_HINFO: - -/* g_message("hinfo"); */ - - if (avahi_dns_packet_consume_string(p, buf, sizeof(buf)) < 0) - goto fail; - - r->data.hinfo.cpu = g_strdup(buf); - - if (avahi_dns_packet_consume_string(p, buf, sizeof(buf)) < 0) - goto fail; - - r->data.hinfo.os = g_strdup(buf); - break; - - case AVAHI_DNS_TYPE_TXT: - -/* g_message("txt"); */ - - if (rdlength > 0) { - r->data.txt.string_list = avahi_string_list_parse(avahi_dns_packet_get_rptr(p), rdlength); - - if (avahi_dns_packet_skip(p, rdlength) < 0) - goto fail; - } else - r->data.txt.string_list = NULL; - - break; - - case AVAHI_DNS_TYPE_A: - -/* g_message("A"); */ - - if (avahi_dns_packet_consume_bytes(p, &r->data.a.address, sizeof(AvahiIPv4Address)) < 0) - goto fail; - - break; - - case AVAHI_DNS_TYPE_AAAA: - -/* g_message("aaaa"); */ - - if (avahi_dns_packet_consume_bytes(p, &r->data.aaaa.address, sizeof(AvahiIPv6Address)) < 0) - goto fail; - - break; - - default: - -/* g_message("generic"); */ - - if (rdlength > 0) { - - r->data.generic.data = g_memdup(avahi_dns_packet_get_rptr(p), rdlength); - - if (avahi_dns_packet_skip(p, rdlength) < 0) - goto fail; - } - - break; - } - -/* g_message("%i == %u ?", (guint8*) avahi_dns_packet_get_rptr(p) - (guint8*) start, rdlength); */ - - /* Check if we read enough data */ - if ((guint8*) avahi_dns_packet_get_rptr(p) - (guint8*) start != rdlength) - goto fail; - - r->ttl = ttl; - - return r; - -fail: - if (r) - avahi_record_unref(r); - - return NULL; -} - -AvahiKey* avahi_dns_packet_consume_key(AvahiDnsPacket *p, gboolean *ret_unicast_response) { - gchar name[256]; - guint16 type, class; - - g_assert(p); - g_assert(ret_unicast_response); - - if (avahi_dns_packet_consume_name(p, name, sizeof(name)) < 0 || - avahi_dns_packet_consume_uint16(p, &type) < 0 || - avahi_dns_packet_consume_uint16(p, &class) < 0) - return NULL; - - *ret_unicast_response = !!(class & AVAHI_DNS_UNICAST_RESPONSE); - class &= ~AVAHI_DNS_UNICAST_RESPONSE; - - return avahi_key_new(name, class, type); -} - -guint8* avahi_dns_packet_append_key(AvahiDnsPacket *p, AvahiKey *k, gboolean unicast_response) { - guint8 *t; - guint size; - - g_assert(p); - g_assert(k); - - size = p->size; - - if (!(t = avahi_dns_packet_append_name(p, k->name)) || - !avahi_dns_packet_append_uint16(p, k->type) || - !avahi_dns_packet_append_uint16(p, k->class | (unicast_response ? AVAHI_DNS_UNICAST_RESPONSE : 0))) { - p->size = size; - return NULL; - } - - return t; -} - -guint8* avahi_dns_packet_append_record(AvahiDnsPacket *p, AvahiRecord *r, gboolean cache_flush, guint max_ttl) { - guint8 *t, *l, *start; - guint size; - - g_assert(p); - g_assert(r); - - size = p->size; - - if (!(t = avahi_dns_packet_append_name(p, r->key->name)) || - !avahi_dns_packet_append_uint16(p, r->key->type) || - !avahi_dns_packet_append_uint16(p, cache_flush ? (r->key->class | AVAHI_DNS_CACHE_FLUSH) : (r->key->class &~ AVAHI_DNS_CACHE_FLUSH)) || - !avahi_dns_packet_append_uint32(p, (max_ttl && r->ttl > max_ttl) ? max_ttl : r->ttl) || - !(l = avahi_dns_packet_append_uint16(p, 0))) - goto fail; - - start = avahi_dns_packet_extend(p, 0); - - switch (r->key->type) { - - case AVAHI_DNS_TYPE_PTR: - case AVAHI_DNS_TYPE_CNAME : - - if (!(avahi_dns_packet_append_name(p, r->data.ptr.name))) - goto fail; - - break; - - case AVAHI_DNS_TYPE_SRV: - - if (!avahi_dns_packet_append_uint16(p, r->data.srv.priority) || - !avahi_dns_packet_append_uint16(p, r->data.srv.weight) || - !avahi_dns_packet_append_uint16(p, r->data.srv.port) || - !avahi_dns_packet_append_name(p, r->data.srv.name)) - goto fail; - - break; - - case AVAHI_DNS_TYPE_HINFO: - if (!avahi_dns_packet_append_string(p, r->data.hinfo.cpu) || - !avahi_dns_packet_append_string(p, r->data.hinfo.os)) - goto fail; - - break; - - case AVAHI_DNS_TYPE_TXT: { - - guint8 *data; - guint size; - - size = avahi_string_list_serialize(r->data.txt.string_list, NULL, 0); - -/* g_message("appending string: %u %p", size, r->data.txt.string_list); */ - - if (!(data = avahi_dns_packet_extend(p, size))) - goto fail; - - avahi_string_list_serialize(r->data.txt.string_list, data, size); - break; - } - - - case AVAHI_DNS_TYPE_A: - - if (!avahi_dns_packet_append_bytes(p, &r->data.a.address, sizeof(r->data.a.address))) - goto fail; - - break; - - case AVAHI_DNS_TYPE_AAAA: - - if (!avahi_dns_packet_append_bytes(p, &r->data.aaaa.address, sizeof(r->data.aaaa.address))) - goto fail; - - break; - - default: - - if (r->data.generic.size && - avahi_dns_packet_append_bytes(p, r->data.generic.data, r->data.generic.size)) - goto fail; - - break; - } - - - - - size = avahi_dns_packet_extend(p, 0) - start; - g_assert(size <= 0xFFFF); - -/* g_message("appended %u", size); */ - - * (guint16*) l = g_htons((guint16) size); - - return t; - - -fail: - p->size = size; - return NULL; -} - -gboolean avahi_dns_packet_is_empty(AvahiDnsPacket *p) { - g_assert(p); - - return p->size <= AVAHI_DNS_PACKET_HEADER_SIZE; -} - -guint avahi_dns_packet_space(AvahiDnsPacket *p) { - g_assert(p); - - g_assert(p->size <= p->max_size); - - return p->max_size - p->size; -} -- cgit