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/***
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 <assert.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <avahi-common/malloc.h>
#include "log.h"
#include "domain-util.h"
#include "util.h"
static void strip_bad_chars(char *s) {
char *p, *d;
s[strcspn(s, ".")] = 0;
for (p = s, d = s; *p; p++)
if ((*p >= 'a' && *p <= 'z') ||
(*p >= 'A' && *p <= 'Z') ||
(*p >= '0' && *p <= '9') ||
*p == '-')
*(d++) = *p;
*d = 0;
}
#ifdef __linux__
static int load_lsb_distrib_id(char *ret_s, size_t size) {
FILE *f;
assert(ret_s);
assert(size > 0);
if (!(f = fopen("/etc/lsb-release", "r")))
return -1;
while (!feof(f)) {
char ln[256], *p;
if (!fgets(ln, sizeof(ln), f))
break;
if (strncmp(ln, "DISTRIB_ID=", 11))
continue;
p = ln + 11;
p += strspn(p, "\"");
p[strcspn(p, "\"")] = 0;
snprintf(ret_s, size, "%s", p);
fclose(f);
return 0;
}
fclose(f);
return -1;
}
#endif
char *avahi_get_host_name(char *ret_s, size_t size) {
assert(ret_s);
assert(size > 0);
if (gethostname(ret_s, size) >= 0) {
ret_s[size-1] = 0;
strip_bad_chars(ret_s);
} else
*ret_s = 0;
if (strcmp(ret_s, "localhost") == 0 || strncmp(ret_s, "localhost.", 10) == 0) {
*ret_s = 0;
avahi_log_warn("System host name is set to 'localhost'. This is not a suitable mDNS host name, looking for alternatives.");
}
if (*ret_s == 0) {
/* No hostname was set, so let's take the OS name */
#ifdef __linux__
/* Try LSB distribution name first */
if (load_lsb_distrib_id(ret_s, size) >= 0) {
strip_bad_chars(ret_s);
avahi_strdown(ret_s);
}
if (*ret_s == 0)
#endif
{
/* Try uname() second */
struct utsname utsname;
if (uname(&utsname) >= 0) {
snprintf(ret_s, size, "%s", utsname.sysname);
strip_bad_chars(ret_s);
avahi_strdown(ret_s);
}
/* Give up */
if (*ret_s == 0)
snprintf(ret_s, size, "unnamed");
}
}
if (size >= AVAHI_LABEL_MAX)
ret_s[AVAHI_LABEL_MAX-1] = 0;
return ret_s;
}
char *avahi_get_host_name_strdup(void) {
char t[AVAHI_DOMAIN_NAME_MAX];
if (!(avahi_get_host_name(t, sizeof(t))))
return NULL;
return avahi_strdup(t);
}
int avahi_binary_domain_cmp(const char *a, const char *b) {
assert(a);
assert(b);
if (a == b)
return 0;
for (;;) {
char ca[AVAHI_LABEL_MAX], cb[AVAHI_LABEL_MAX], *p;
int r;
p = avahi_unescape_label(&a, ca, sizeof(ca));
assert(p);
p = avahi_unescape_label(&b, cb, sizeof(cb));
assert(p);
if ((r = strcmp(ca, cb)))
return r;
if (!*a && !*b)
return 0;
}
}
int avahi_domain_ends_with(const char *domain, const char *suffix) {
assert(domain);
assert(suffix);
for (;;) {
char dummy[AVAHI_LABEL_MAX], *r;
if (*domain == 0)
return 0;
if (avahi_domain_equal(domain, suffix))
return 1;
r = avahi_unescape_label(&domain, dummy, sizeof(dummy));
assert(r);
}
}
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