+++ /dev/null
-/***
- 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 <config.h>
-#endif
-
-#include <stdlib.h>
-#include <sys/types.h>
-#include <assert.h>
-#include <string.h>
-
-#include <avahi-common/malloc.h>
-
-#include "dns_sd.h"
-#include "warn.h"
-
-typedef struct TXTRecordInternal {
- uint8_t *buffer, *malloc_buffer;
- size_t size, max_size;
-} TXTRecordInternal;
-
-#define INTERNAL_PTR(txtref) (* (TXTRecordInternal**) (txtref))
-#define INTERNAL_PTR_CONST(txtref) (* (const TXTRecordInternal* const *) (txtref))
-
-void DNSSD_API TXTRecordCreate(
- TXTRecordRef *txtref,
- uint16_t length,
- void *buffer) {
-
- TXTRecordInternal *t;
-
- AVAHI_WARN_LINKAGE;
-
- assert(txtref);
-
- /* Apple's API design is flawed in so many ways, including the
- * fact that it isn't compatible with 64 bit processors. To work
- * around this we need some magic here which involves allocating
- * our own memory. Please, Apple, do your homework next time
- * before designing an API! */
-
- if ((t = avahi_new(TXTRecordInternal, 1))) {
- t->buffer = buffer;
- t->max_size = buffer ? length : (size_t)0;
- t->size = 0;
- t->malloc_buffer = NULL;
- }
-
- /* If we were unable to allocate memory, we store a NULL pointer
- * and return a NoMemory error later, is somewhat unclean, but
- * should work. */
- INTERNAL_PTR(txtref) = t;
-}
-
-void DNSSD_API TXTRecordDeallocate(TXTRecordRef *txtref) {
- TXTRecordInternal *t;
-
- AVAHI_WARN_LINKAGE;
-
- assert(txtref);
- t = INTERNAL_PTR(txtref);
- if (!t)
- return;
-
- avahi_free(t->malloc_buffer);
- avahi_free(t);
-
- /* Just in case ... */
- INTERNAL_PTR(txtref) = NULL;
-}
-
-static int make_sure_fits_in(TXTRecordInternal *t, size_t size) {
- uint8_t *n;
- size_t nsize;
-
- assert(t);
-
- if (t->size + size <= t->max_size)
- return 0;
-
- nsize = t->size + size + 100;
-
- if (nsize > 0xFFFF)
- return -1;
-
- if (!(n = avahi_realloc(t->malloc_buffer, nsize)))
- return -1;
-
- if (!t->malloc_buffer && t->size)
- memcpy(n, t->buffer, t->size);
-
- t->buffer = t->malloc_buffer = n;
- t->max_size = nsize;
-
- return 0;
-}
-
-static int remove_key(TXTRecordInternal *t, const char *key) {
- size_t i;
- uint8_t *p;
- size_t key_len;
- int found = 0;
-
- key_len = strlen(key);
- assert(key_len <= 0xFF);
-
- p = t->buffer;
- i = 0;
-
- while (i < t->size) {
-
- /* Does the item fit in? */
- assert(*p <= t->size - i - 1);
-
- /* Key longer than buffer */
- if (key_len > t->size - i - 1)
- break;
-
- if (key_len <= *p &&
- strncmp(key, (char*) p+1, key_len) == 0 &&
- (key_len == *p || p[1+key_len] == '=')) {
-
- uint8_t s;
-
- /* Key matches, so let's remove it */
-
- s = *p;
- memmove(p, p + 1 + *p, t->size - i - *p -1);
- t->size -= s + 1;
-
- found = 1;
- } else {
- /* Skip to next */
-
- i += *p +1;
- p += *p +1;
- }
- }
-
- return found;
-}
-
-DNSServiceErrorType DNSSD_API TXTRecordSetValue(
- TXTRecordRef *txtref,
- const char *key,
- uint8_t length,
- const void *value) {
-
- TXTRecordInternal *t;
- uint8_t *p;
- size_t l, n;
-
- AVAHI_WARN_LINKAGE;
-
- assert(key);
- assert(txtref);
-
- l = strlen(key);
-
- if (*key == 0 || strchr(key, '=') || l > 0xFF) /* Empty or invalid key */
- return kDNSServiceErr_Invalid;
-
- if (!(t = INTERNAL_PTR(txtref)))
- return kDNSServiceErr_NoMemory;
-
- n = l + (value ? length + 1 : 0);
-
- if (n > 0xFF)
- return kDNSServiceErr_Invalid;
-
- if (make_sure_fits_in(t, 1 + n) < 0)
- return kDNSServiceErr_NoMemory;
-
- remove_key(t, key);
-
- p = t->buffer + t->size;
-
- *(p++) = (uint8_t) n;
- t->size ++;
-
- memcpy(p, key, l);
- p += l;
- t->size += l;
-
- if (value) {
- *(p++) = '=';
- memcpy(p, value, length);
- t->size += length + 1;
- }
-
- assert(t->size <= t->max_size);
-
- return kDNSServiceErr_NoError;
-}
-
-DNSServiceErrorType DNSSD_API TXTRecordRemoveValue(TXTRecordRef *txtref, const char *key) {
- TXTRecordInternal *t;
- int found;
-
- AVAHI_WARN_LINKAGE;
-
- assert(key);
- assert(txtref);
-
- if (*key == 0 || strchr(key, '=') || strlen(key) > 0xFF) /* Empty or invalid key */
- return kDNSServiceErr_Invalid;
-
- if (!(t = INTERNAL_PTR(txtref)))
- return kDNSServiceErr_NoError;
-
- found = remove_key(t, key);
-
- return found ? kDNSServiceErr_NoError : kDNSServiceErr_NoSuchKey;
-}
-
-uint16_t DNSSD_API TXTRecordGetLength(const TXTRecordRef *txtref) {
- const TXTRecordInternal *t;
-
- AVAHI_WARN_LINKAGE;
-
- assert(txtref);
-
- if (!(t = INTERNAL_PTR_CONST(txtref)))
- return 0;
-
- assert(t->size <= 0xFFFF);
- return (uint16_t) t->size;
-}
-
-const void * DNSSD_API TXTRecordGetBytesPtr(const TXTRecordRef *txtref) {
- const TXTRecordInternal *t;
-
- AVAHI_WARN_LINKAGE;
-
- assert(txtref);
-
- if (!(t = INTERNAL_PTR_CONST(txtref)) || !t->buffer)
- return "";
-
- return t->buffer;
-}
-
-static const uint8_t *find_key(const uint8_t *buffer, size_t size, const char *key) {
- size_t i;
- const uint8_t *p;
- size_t key_len;
-
- key_len = strlen(key);
-
- assert(key_len <= 0xFF);
-
- p = buffer;
- i = 0;
-
- while (i < size) {
-
- /* Does the item fit in? */
- if (*p > size - i - 1)
- return NULL;
-
- /* Key longer than buffer */
- if (key_len > size - i - 1)
- return NULL;
-
- if (key_len <= *p &&
- strncmp(key, (const char*) p+1, key_len) == 0 &&
- (key_len == *p || p[1+key_len] == '=')) {
-
- /* Key matches, so let's return it */
-
- return p;
- }
-
- /* Skip to next */
- i += *p +1;
- p += *p +1;
- }
-
- return NULL;
-}
-
-int DNSSD_API TXTRecordContainsKey (
- uint16_t size,
- const void *buffer,
- const char *key) {
-
- AVAHI_WARN_LINKAGE;
-
- assert(key);
-
- if (!size)
- return 0;
-
- assert(buffer);
-
- if (!(find_key(buffer, size, key)))
- return 0;
-
- return 1;
-}
-
-const void * DNSSD_API TXTRecordGetValuePtr(
- uint16_t size,
- const void *buffer,
- const char *key,
- uint8_t *value_len) {
-
- const uint8_t *p;
- size_t n, l;
-
- AVAHI_WARN_LINKAGE;
-
- assert(key);
-
- if (!size)
- goto fail;
-
- if (*key == 0 || strchr(key, '=') || strlen(key) > 0xFF) /* Empty or invalid key */
- return NULL;
-
- assert(buffer);
-
- if (!(p = find_key(buffer, size, key)))
- goto fail;
-
- n = *p;
- l = strlen(key);
-
- assert(n >= l);
- p += 1 + l;
- n -= l;
-
- if (n <= 0)
- goto fail;
-
- assert(*p == '=');
- p++;
- n--;
-
- if (value_len)
- *value_len = n;
-
- return p;
-
-fail:
- if (value_len)
- *value_len = 0;
-
- return NULL;
-}
-
-
-uint16_t DNSSD_API TXTRecordGetCount(
- uint16_t size,
- const void *buffer) {
-
- const uint8_t *p;
- unsigned n = 0;
- size_t i;
-
- AVAHI_WARN_LINKAGE;
-
- if (!size)
- return 0;
-
- assert(buffer);
-
- p = buffer;
- i = 0;
-
- while (i < size) {
-
- /* Does the item fit in? */
- if (*p > size - i - 1)
- break;
-
- n++;
-
- /* Skip to next */
- i += *p +1;
- p += *p +1;
- }
-
- assert(n <= 0xFFFF);
-
- return (uint16_t) n;
-}
-
-DNSServiceErrorType DNSSD_API TXTRecordGetItemAtIndex(
- uint16_t size,
- const void *buffer,
- uint16_t idx,
- uint16_t key_len,
- char *key,
- uint8_t *value_len,
- const void **value) {
-
- const uint8_t *p;
- size_t i;
- unsigned n = 0;
- DNSServiceErrorType ret = kDNSServiceErr_Invalid;
-
- AVAHI_WARN_LINKAGE;
-
- if (!size)
- goto fail;
-
- assert(buffer);
-
- p = buffer;
- i = 0;
-
- while (i < size) {
-
- /* Does the item fit in? */
- if (*p > size - i - 1)
- goto fail;
-
- if (n >= idx) {
- size_t l;
- const uint8_t *d;
-
- d = memchr(p+1, '=', *p);
-
- /* Length of key */
- l = d ? d - p - 1 : *p;
-
- if (key_len < l+1) {
- ret = kDNSServiceErr_NoMemory;
- goto fail;
- }
-
- strncpy(key, (const char*) p + 1, l);
- key[l] = 0;
-
- if (d) {
- if (value_len)
- *value_len = *p - l - 1;
-
- if (value)
- *value = d + 1;
- } else {
-
- if (value_len)
- *value_len = 0;
-
- if (value)
- *value = NULL;
- }
-
- return kDNSServiceErr_NoError;
- }
-
- n++;
-
- /* Skip to next */
- i += *p +1;
- p += *p +1;
- }
-
-
-fail:
-
- if (value)
- *value = NULL;
-
- if (value_len)
- *value_len = 0;
-
- return ret;
-
-}
projects / catta / blobdiff