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-rw-r--r--avahi-common/util.c428
1 files changed, 428 insertions, 0 deletions
diff --git a/avahi-common/util.c b/avahi-common/util.c
new file mode 100644
index 0000000..a41475a
--- /dev/null
+++ b/avahi-common/util.c
@@ -0,0 +1,428 @@
+/* $Id$ */
+
+/***
+ 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 <config.h>
+#endif
+
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+#include "util.h"
+
+gchar *avahi_get_host_name(void) {
+#ifdef HOST_NAME_MAX
+ char t[HOST_NAME_MAX];
+#else
+ char t[256];
+#endif
+ gethostname(t, sizeof(t));
+ t[sizeof(t)-1] = 0;
+ return avahi_normalize_name(t);
+}
+
+static gchar *unescape_uneeded(const gchar *src, gchar *ret_dest, size_t size) {
+ gboolean escaped = FALSE;
+
+ g_assert(src);
+ g_assert(ret_dest);
+ g_assert(size > 0);
+
+ for (; *src; src++) {
+
+ if (!escaped && *src == '\\')
+ escaped = TRUE;
+ else if (escaped && (*src == '.' || *src == '\\')) {
+
+ if ((size -= 2) <= 1) break;
+
+ *(ret_dest++) = '\\';
+ *(ret_dest++) = *src;
+ escaped = FALSE;
+ } else {
+ if (--size <= 1) break;
+
+ *(ret_dest++) = *src;
+ escaped = FALSE;
+ }
+
+ }
+
+ *ret_dest = 0;
+
+ return ret_dest;
+}
+
+gchar *avahi_normalize_name(const gchar *s) {
+ gchar tmp[256];
+ gchar *n, *t;
+ guint l;
+ g_assert(s);
+
+ unescape_uneeded(s, tmp, sizeof(tmp));
+
+ n = g_utf8_normalize(tmp, -1, G_NORMALIZE_DEFAULT);
+
+ if ((l = strlen(n)) == 0) {
+ g_free(n);
+ return g_strdup(".");
+ }
+
+ if (n[l-1] == '.')
+ return n;
+
+ t = g_strdup_printf("%s.", n);
+ g_free(n);
+ return t;
+}
+
+gint avahi_timeval_compare(const GTimeVal *a, const GTimeVal *b) {
+ g_assert(a);
+ g_assert(b);
+
+ if (a->tv_sec < b->tv_sec)
+ return -1;
+
+ if (a->tv_sec > b->tv_sec)
+ return 1;
+
+ if (a->tv_usec < b->tv_usec)
+ return -1;
+
+ if (a->tv_usec > b->tv_usec)
+ return 1;
+
+ return 0;
+}
+
+glong avahi_timeval_diff(const GTimeVal *a, const GTimeVal *b) {
+ g_assert(a);
+ g_assert(b);
+
+ if (avahi_timeval_compare(a, b) < 0)
+ return avahi_timeval_diff(b, a);
+
+ return ((glong) a->tv_sec - b->tv_sec)*1000000 + a->tv_usec - b->tv_usec;
+}
+
+
+gint avahi_set_cloexec(gint fd) {
+ gint n;
+
+ g_assert(fd >= 0);
+
+ if ((n = fcntl(fd, F_GETFD)) < 0)
+ return -1;
+
+ if (n & FD_CLOEXEC)
+ return 0;
+
+ return fcntl(fd, F_SETFD, n|FD_CLOEXEC);
+}
+
+gint avahi_set_nonblock(gint fd) {
+ gint n;
+
+ g_assert(fd >= 0);
+
+ if ((n = fcntl(fd, F_GETFL)) < 0)
+ return -1;
+
+ if (n & O_NONBLOCK)
+ return 0;
+
+ return fcntl(fd, F_SETFL, n|O_NONBLOCK);
+}
+
+gint avahi_wait_for_write(gint fd) {
+ fd_set fds;
+ gint r;
+
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+
+ if ((r = select(fd+1, NULL, &fds, NULL, NULL)) < 0) {
+ g_message("select() failed: %s", strerror(errno));
+
+ return -1;
+ }
+
+ g_assert(r > 0);
+
+ return 0;
+}
+
+GTimeVal *avahi_elapse_time(GTimeVal *tv, guint msec, guint jitter) {
+ g_assert(tv);
+
+ g_get_current_time(tv);
+
+ if (msec)
+ g_time_val_add(tv, msec*1000);
+
+ if (jitter)
+ g_time_val_add(tv, g_random_int_range(0, jitter) * 1000);
+
+ return tv;
+}
+
+glong avahi_age(const GTimeVal *a) {
+ GTimeVal now;
+
+ g_assert(a);
+
+ g_get_current_time(&now);
+
+ return avahi_timeval_diff(&now, a);
+}
+
+/* Read the first label from string *name, unescape "\" and write it to dest */
+gchar *avahi_unescape_label(const gchar **name, gchar *dest, guint size) {
+ guint i = 0;
+ gchar *d;
+
+ g_assert(dest);
+ g_assert(size > 0);
+ g_assert(name);
+
+ if (!**name)
+ return NULL;
+
+ d = dest;
+
+ for (;;) {
+ if (i >= size)
+ return NULL;
+
+ if (**name == '.') {
+ (*name)++;
+ break;
+ }
+
+ if (**name == 0)
+ break;
+
+ if (**name == '\\') {
+ (*name) ++;
+
+ if (**name == 0)
+ break;
+ }
+
+ *(d++) = *((*name) ++);
+ i++;
+ }
+
+ g_assert(i < size);
+
+ *d = 0;
+
+ return dest;
+}
+
+/* Escape "\" and ".", append \0 */
+gchar *avahi_escape_label(const guint8* src, guint src_length, gchar **ret_name, guint *ret_size) {
+ gchar *r;
+
+ g_assert(src);
+ g_assert(ret_name);
+ g_assert(*ret_name);
+ g_assert(ret_size);
+ g_assert(*ret_size > 0);
+
+ r = *ret_name;
+
+ while (src_length > 0) {
+ if (*src == '.' || *src == '\\') {
+ if (*ret_size < 3)
+ return NULL;
+
+ *((*ret_name) ++) = '\\';
+ (*ret_size) --;
+ }
+
+ if (*ret_size < 2)
+ return NULL;
+
+ *((*ret_name)++) = *src;
+ (*ret_size) --;
+
+ src_length --;
+ src++;
+ }
+
+ **ret_name = 0;
+
+ return r;
+}
+
+static gint utf8_strcasecmp(const gchar *a, const gchar *b) {
+ gchar *ta, *tb;
+ gint r;
+
+ g_assert(a);
+ g_assert(b);
+
+ ta = g_utf8_casefold(a, -1);
+ tb = g_utf8_casefold(b, -1);
+ r = g_utf8_collate(ta, tb);
+ g_free(ta);
+ g_free(tb);
+
+ return r;
+}
+
+gboolean avahi_domain_equal(const gchar *a, const gchar *b) {
+ g_assert(a);
+ g_assert(b);
+
+ if (a == b)
+ return TRUE;
+
+ for (;;) {
+ gchar ca[65], cb[65], *pa, *pb;
+
+ pa = avahi_unescape_label(&a, ca, sizeof(ca));
+ pb = avahi_unescape_label(&b, cb, sizeof(cb));
+
+ if (!pa && !pb)
+ return TRUE;
+ else if ((pa && !pb) || (!pa && pb))
+ return FALSE;
+
+ if (utf8_strcasecmp(pa, pb))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+gint avahi_binary_domain_cmp(const gchar *a, const gchar *b) {
+ g_assert(a);
+ g_assert(b);
+
+ if (a == b)
+ return 0;
+
+ for (;;) {
+ gchar ca[65], cb[65], *pa, *pb;
+ gint r;
+
+ pa = avahi_unescape_label(&a, ca, sizeof(ca));
+ pb = avahi_unescape_label(&b, cb, sizeof(cb));
+
+ if (!pa && !pb)
+ return 0;
+ else if (pa && !pb)
+ return 1;
+ else if (!pa && pb)
+ return -1;
+
+ if ((r = strcmp(pa, pb)))
+ return r;
+ }
+}
+
+void avahi_hexdump(gconstpointer p, guint size) {
+ const guint8 *c = p;
+ g_assert(p);
+
+ printf("Dumping %u bytes from %p:\n", size, p);
+
+ while (size > 0) {
+ guint i;
+
+ for (i = 0; i < 16; i++) {
+ if (i < size)
+ printf("%02x ", c[i]);
+ else
+ printf(" ");
+ }
+
+ for (i = 0; i < 16; i++) {
+ if (i < size)
+ printf("%c", c[i] >= 32 && c[i] < 127 ? c[i] : '.');
+ else
+ printf(" ");
+ }
+
+ printf("\n");
+
+ c += 16;
+
+ if (size <= 16)
+ break;
+
+ size -= 16;
+ }
+}
+
+guint avahi_domain_hash(const gchar *s) {
+ guint hash = 0;
+
+ for (;;) {
+ gchar c[65], *n, *m;
+
+ if (!avahi_unescape_label(&s, c, sizeof(c)))
+ return hash;
+
+ if (!c[0])
+ continue;
+
+ n = g_utf8_normalize(c, -1, G_NORMALIZE_DEFAULT);
+ m = g_utf8_strdown(n, -1);
+
+ hash += g_str_hash(m);
+
+ g_free(m);
+ g_free(n);
+ }
+}
+
+gchar *avahi_format_mac_address(const guint8* mac, guint size) {
+ gchar *r, *t;
+ guint i;
+ static const gchar hex[] = "0123456789abcdef";
+
+ t = r = g_new(gchar, size > 0 ? size*3 : 1);
+
+ if (size <= 0) {
+ *r = 0;
+ return r;
+ }
+
+ for (i = 0; i < size; i++) {
+ *(t++) = hex[*mac >> 4];
+ *(t++) = hex[*mac & 0xF];
+ *(t++) = ':';
+
+ mac++;
+ }
+
+ *(--t) = 0;
+ return r;
+}
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