#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"
-char *avahi_get_host_name(char *ret_s, size_t size) {
-#ifdef HOST_NAME_MAX
- char t[HOST_NAME_MAX];
-#else
- char t[256];
-#endif
+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.");
+ }
- gethostname(t, sizeof(t));
- t[sizeof(t)-1] = 0;
+ 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 avahi_normalize_name(t, ret_s, size);
+ return ret_s;
}
char *avahi_get_host_name_strdup(void) {